Diminished seventh chord

The diminished seventh chord is a four-note chord (a seventh chord) composed of a root note, together with a minor third, a diminished fifth, and a diminished seventh above the root: (1, 3, 5, double flat7). For example, the diminished seventh chord built on B, commonly written as Bo7, has pitches B-D-F-A:


{
\override Score.TimeSignature #'stencil = ##f
\relative c' {
   \clef treble 
   \time 4/4
   \key c \major
   <b d f aes>1
} }
diminished seventh
Component intervals from root
diminished seventh (tritone)
diminished fifth (tritone)
minor third
root
Tuning
125:150:180:216[1]
Forte no. / Complement
4–28 / 8–28

As such, a diminished seventh chord comprises a diminished triad plus a diminished seventh. Because of this, it can also be viewed as four notes all stacked in intervals of a minor third and can be represented by the integer notation {0, 3, 6, 9}.

Since a diminished seventh interval is enharmonically equivalent to a major sixth, the chord is enharmonically equivalent to (1, 3, 5, 6).

The diminished seventh chord occurs as a leading-tone seventh chord in the harmonic minor scale. It typically has dominant function and contains two diminished fifths, which often resolve inwards.[2]

In most sheet music books, the notation Cdim or Co denotes a diminished seventh chord with root C; but it may also happen, mostly in modern jazz books and some music theory literature, that Cdim or Co denotes a diminished triad (more commonly denoted Cm5), while Cdim7 or Co7 in these books denotes a diminished seventh chord (corresponding to Cm65).

François-Joseph Fétis tuned the chord 10:12:14:17 (17-limit tuning).[3]

Analysis

Music theorists have struggled over the centuries to explain the meaning and function of diminished seventh chords. Currently, two approaches are generally used.

The less complex method treats the leading tone as the root of the chord and the other chord members as the third, fifth, and seventh of the chord, the same way other seventh chords are analyzed.

The other method is to analyze the chord as an "incomplete dominant ninth", that is a ninth chord with its root on the dominant, whose root is missing or implied. A viio7 chord in the minor key (for example, in C minor, B–D–F–A) occurs naturally in the harmonic minor scale and is equivalent to the dominant 79 chord (G–B–D–F–A) without its root.

 {
\override Score.TimeSignature
#'stencil = ##f
    \relative c'' {
        \time 4/4 \key c \minor
        <\parenthesize g b d f aes>1 \bar "||"
    }
}

This was already proposed by Arnold Schoenberg,[4] and Walter Piston championed this analysis.[5] Jazz guitarist Sal Salvador, and other jazz theorists, also advocated this view, rewriting chord charts to reflect this and supplying the "missing" root as part of their bass lines.[6] The dominant ninth theory was questioned by Heinrich Schenker. He explained that although there is a kinship between all univalent chords rising out of the fifth degree, the dominant ninth chord is not a real chord formation.[7]

Jean-Philippe Rameau explained the diminished seventh chord as a dominant seventh chord whose supposed fundamental bass is borrowed from the sixth degree in minor, raised a semitone producing a stack of minor thirds.[8] Thus, in C, the dominant seventh is G7 (G–B–D–F) and the sixth degree borrowed from the minor scale produces A–B–D–F.[8]

 {
\override Score.TimeSignature
#'stencil = ##f
    \relative c'' {
        \time 4/4 \key c \major
        <g b d f>1 <aes b d f> \bar "||"
    }
}

In his Treatise on Harmony, he observed that three minor thirds and an augmented second make up a chord where the augmented second is such that "the ear is not offended" by it. He may have been talking of the augmented second in quarter-comma meantone, a tuning he favored, which is close to the just septimal minor third of 7:6.

Function

Most common functions


   \new PianoStaff <<
      \new Staff <<
         \new Voice \relative c'' {
             \stemUp \clef treble \key c \minor \time 4/4
             aes1 g 
             }
         \new Voice \relative c' {
             \stemDown
              d1 es
              }
            >>
     \new Staff <<
         \new Voice \relative c {
             \stemUp \clef bass \key c \minor \time 4/4
             f1 es
             }
         \new Voice \relative c {
             \stemDown
             b1_\markup { \concat { "vii" \raise #1 \small "o7" \hspace #4.3 "i" } } c \bar "||"
             }
         >>
    >>
Diminished seventh chord resolution: both diminished fifths tend to resolve inward, doubling the third of the tonic chord

The most common form of the diminished seventh chord is that rooted on the leading tone – for example, in the key of C, the chord (B–D–F–A) – so its other constituents are the scale degree 2, scale degree 4, and scale degree 6 (flat submediant) scale degrees. These notes occur naturally in the harmonic minor scale. But this chord also appears in major keys, especially after the time of J.S. Bach, where it is borrowed from the parallel minor.

The chord possesses a dominant function when rooted on the leading tone (otherwise it doesn't, but can serve other functions - see below), and this is most straightforwardly shown when the root of a dominant seventh chord is omitted. The remaining third, fifth and seventh of that chord form a diminished triad (whose new root is the third of the former chord), to which a diminished seventh can be added. Thus, in C (major or minor), a dominant seventh chord consisting of G–B–D–F can be replaced by a diminished seventh chord B–D–F–A.

 {
\override Score.TimeSignature
#'stencil = ##f
    \relative c'' {
        \time 4/4
        <g b d f>1 <b d f aes> \bar "||"
    }
}

In jazz harmony, a combination of the original chord with its substitute (with G in the bass and A simultaneously in an upper voice) yields the seven flat-9 chord, which intensifies the dominant function of either a diminished seventh or dominant seventh chord. Other transformations of this kind facilitate a variety of substitutions and modulations: any of the four notes in a diminished seventh chord are raised by a semitone, that raised note is then the flat-seventh of a half-diminished seventh chord. Similarly, if any of the four notes in the diminished seventh chord are lowered by a semitone, that lowered note is then the root of a dominant seventh chord.

Diminished seventh chords may also be rooted on scale degrees other than the leading-tone, either as secondary function chords temporarily borrowed from other keys, or as appoggiatura chords: a chord rooted on the raised second scale degree (D–F–A–C in the key of C) acts as an appoggiatura to the tonic (C major) chord, and one rooted on the raised sixth scale degree (A–C–E–G in C major) acts as an appoggiatura to the dominant (G major) chord. Such chords however, having no leading tone in relation to the chords to which they resolve, cannot properly have a dominant function. They are therefore referred to commonly as non-dominant diminished seventh chords or common tone diminished seventh chords (see below).

In jazz, the diminished seventh chord is often based on the scale degree 3 scale degree (the flat mediant) and acts as a passing chord between the mediant triad (or first-inversion tonic triad) and the supertonic triad: in C major, this would be the chord progression E minor – E diminished – D minor. The chord, "plays no role in... jazz."[9] The passing chord is used widely in Brazilian music such as choro, samba and bossa nova.

Other functions


   \new PianoStaff <<
      \new Staff <<
         \new Voice \relative c'' {
             \stemUp \clef treble \key c \major \time 4/4
             f2 es d1 c
             }
         \new Voice \relative c'' {
             \stemDown
              <a c>1 <f b> <e g>
              }
            >>
     \new Staff <<
         \new Voice \relative c {
             \clef bass \key c \major \time 4/4
             f2 fis g1 c \bar "||"
             }
         >>
    >>
A chord progression with a sharpened subdominant with diminished seventh chord

Another common use of the chord is as a sharpened subdominant with diminished seventh chord. This is represented by the Roman notation ivo7, but in classical music is more correctly represented as viio7/V, being a very common way for a composer to approach the dominant of any key. In the key of C, this is Fdim7. It is also a common chord in jazz and ragtime music. A common traditional jazz or Dixieland progression is IV–ivo7–V7 (in C major: F–Fo7–G7). Another common usage of ivo7 is often found in Gospel music and jazz progressions such as in the song "I Got Rhythm":

In C: | C C/E | F Fdim7 | C/G A7 | Dm7 G7 |

One variant of the supertonic seventh chord is the supertonic diminished seventh[10] with the raised supertonic, which is enharmonically equivalent to the lowered third (in C: D = E). It may be used as a dominant substitute.[11]


    {
      \new StaffGroup <<
        \new Staff <<
            \new Voice \relative c' {
                \stemUp \clef "treble_8" \key bes \major \time 3/4
                es4 es2 cis2 cis4 d2 d4 es2 r4
                }
            \new Voice \relative c' {
                \stemDown
                bes4 c2 bes2 g4 f2._~ f2 s4
                }
           \addlyrics { good old sum mer time __ }
            >>
        \new Staff <<
            \new Voice \relative c' {
                \stemUp \clef bass \key bes \major \time 3/4
                g4 g2 g2 bes4 bes2 aes4 a!2 r4
                }
            \new Voice \relative c {
                \stemDown
                es4 es2 es2 es4 bes2 b4 c2 s4 \bar "||"
                }
           \addlyrics { good old sum mer, sum mer time __ }
            >>
    >> }
According to Benward and Saker, "The... [iio7 and vio7] chords are very common in 20th-century 'barbershop' quartet music."[12] The music shows the chord progression IV–vi6–Ger+6–I vio6
5
–V4
3
.

    {
      \new PianoStaff <<
        \new Staff <<
            \relative c' {
                \tempo "Tempo di Valse"
                \clef treble \key d \major \time 3/4
                \override DynamicText.X-offset = #-4
                \once \override DynamicLineSpanner.staff-padding = #3
                <e a>4--\f <e a cis>-- <e a cis e>-- <fis a bis fis'>2->\sf <e a cis e>4-- <e a cis e>2.~ <e a cis e>8 r r4 r
                }
            >>
        \new Staff <<
            \new Voice \relative c {
                \clef bass \key d \major \time 3/4
                <a e' a cis>4--_\markup { \concat { "V" \hspace #10 "♯vi" \raise #1 \small "o" \combine \raise #1 \small 4 \lower #1 \small 2 \hspace #1 "V" } } <a e' a cis>-- <a e' a cis>-- <a dis a' bis>2-> <a e' a cis>4-- <a e' a cis>2.~ <a e' a cis>8 r r4 r
                }
            >>
    >> }
Example (Bo4
2
) in the Waltz of the Flowers (1892)[13][12]

A diminished seventh chord may function as a common-tone diminished seventh chord. In this role, a diminished seventh chord resolves to a major or dominant seventh chord whose root is one of the notes of the diminished seventh chord (common tone), the most common being the raised supertonic seventh, which resolves to the tonic in major keys (iio7–I, shown below) and the raised submediant, which resolves to dominant triad or seventh in major keys (vio7–V, shown right), with the altered tones resolving upward by half step in both cases.[12]


{
\override Score.TimeSignature
#'stencil = ##f
\time 4/4 
\relative c' { 
      <dis a' c fis>1_\markup { \concat { "♯ii" \raise #1 \small "o7" \hspace #4 "I" \raise #1 \small "6" } } <e g c g'> \bar "||"
   }
}

The cto7 chord, whose function, "is simply one of embellishment," most often spelled iio7 when embellishing I or vio7 when embellishing V, is distinguished from the viio7/V chord by common tone chords resolving to I or I6 while viio7/V resolves to V or I6
4
.[13] They may be confused, due to enharmonic equivalency, but resolution is a better indicator of function than spelling. In C:

cto7/I = do7 = D–F–A–C
viio7/V = fo7 = F–A–C–E (= D)

The diminished chord may also resolve through lowering two of the chord tones producing a supertonic seventh chord (ii7) that may lead to a conventional cadence:[14]


{
  \set Score.proportionalNotationDuration = #(ly:make-moment 1/4)
\override Score.TimeSignature
#'stencil = ##f
\time 4/4 
\key d \major
\relative c'' { 
      <b d f aes>2_\markup { \concat { "vii" \raise #1 \small "o7" \hspace #1.2 "ii" \raise #1 \small "7"  \hspace #4.7 "V" \raise #1 \small "7" \hspace #4 "I" } } <b d e g> <a cis e g> <a d fis> \bar "||"
   }
}

Expressive potential

During the Baroque era (1600–1750), European composers became aware of the expressive potential of the diminished seventh chord. In operas and other dramatic works, the chord was frequently used to heighten the sense of passion, anger, danger or mystery. One famous example can be found in J. S. Bach's St. Matthew Passion (1737), in which he sets verses from the Gospel of Matthew, chapter 27, verses 20–21: "But the chief priests and elders persuaded the multitude that they should ask Barabbas, and destroy Jesus. The governor [Pilate] answered and said unto them, 'Whether of the twain will ye that I release unto you?' They said, 'Barabbas'." Bach sets the text so that the angry multitude's harsh reply on the word Barabbam is a diminished seventh chord:


    { \new StaffGroup <<
        \new Staff <<
            \set Staff.midiInstrument = #"voice oohs"
            \clef treble \key d \minor \time 4/4
            \relative c' {
                \set Score.tempoHideNote = ##t \tempo 8 = 120
                \clef treble \key c \major \time 2/4
                <fis a c fis>8.^\markup { "Choir" } <fis a c fis>16 <fis a c fis>4
                }
            \addlyrics { Ba -- rab -- bam! }
            >>
        \new Staff <<
            \set Staff.midiInstrument = #"church organ"
            \clef bass \key d \minor \time 2/4
            \new Voice \relative c {
                <dis dis'>8. <dis dis'>16 <dis dis'>4
                }
            >>
    >> }

After Bach, diminished sevenths were to feature regularly in music to evoke the uncanny or sense of impending danger. A powerful diminished seventh chord heralds the resurrection of the murdered Commendatore in the final scene of Mozart's Don Giovanni (1787). The dead man's statue comes to life and takes the Don down to Hell in one of the most chilling episodes in the entire operatic repertoire (Listen):


{
      <<
        \new Staff <<
            \tempo Andante
            \relative c' {
                \set Score.tempoHideNote = ##t \tempo 4 = 86
                \set Staff.midiInstrument = #"trombone"
                \clef bass \key d \minor \time 4/4
                R1 R1 R1 r2 a4.^\markup { COMMENDATORE } a8 d2 d, r4 d f d a'2 a
                }
                \addlyrics { Don Gio -- van -- ni! A ce -- nar te -- co }
            >>
      \new PianoStaff <<
        \new Staff <<
           \set Staff.midiInstrument = #"string ensemble 1"
           \clef treble \key d \minor \time 4/4
           \relative c'' {
                \override DynamicLineSpanner.staff-padding = #3
                <d f gis d'>4\ff <d f gis d'>2 <d f gis d'>4~ <d f gis d'>4 r4 r2 <a e' g! a>4 <a e' g a>2 <a e' g a>4~ <a e' g a>4 r4 r2 <a, f'>4.\p <a f'>8 <a f'>4. <a f'>8 <a f'>4. <a f'>8 <a f'>4. <a f'>8 <a e'>4. <a e'>8 <a e'>4. <a e'>8
                }
            >>
        \new Staff <<
           \clef bass \key d \minor \time 4/4
           \relative c, {
                <b b'>2 <b b'> <b b'> r <cis cis'> <cis cis'> <cis cis'> r d'4. d8 d4. d8 d4. d8 d4. d8 c4. c8 c4. c8
                }
            >>
    >>  >> }

In the early years of the 19th century, composers used the diminished seventh with increasing frequency. In "Die Stadt", one of his darkest and most melancholy songs from Schwanengesang (1828), Franz Schubert conjures "the pianistic elaboration of a diminished seventh over an octave tremolo"[15] to convey the sinister rippling of the oars as the protagonist is rowed across a lake towards the town where his lost beloved once lived. According to Edward T. Cone, "This famous arpeggiation seems to arise from nowhere to create an atmospheric prelude... and it dies away to nothing in a postlude."[15] The song ends on the diminished seventh chord; there is no resolution, "the dissonance is terminal":[15]


{
      #(set-global-staff-size 17)
      <<
      \new PianoStaff <<
        \new Staff <<
           \tempo "Mässig geschwind"
           \clef treble \key c \minor \time 3/4
            \set Score.currentBarNumber = #35
            \bar ""
           \relative c'' {
                R2.
                R
                \tuplet 9/8 { a32([ c es fis a fis es c a)] } <c, es fis a>8->([ a16)] r \clef bass <c, es fis a>8->([ a16)] r \clef treble
                \tuplet 9/8 { a''32([ c es fis a fis es c a)] } <c, es fis a>8->([ a16)] r \clef bass <c, es fis a>8->([ a16)] r \clef treble
                \tuplet 9/8 { a''32([ c es fis a fis es c a)] } <c, es fis a>8->([ a16)] r \clef bass <c, es fis a>8->([ a16)] r
                R2.\fermata
                }
            >>
        \new Staff <<
           \clef bass \key c \minor \time 3/4
           \relative c, {
                c32^\markup {\dynamic pp \italic "con pedale" } c' c, c' c, c' c, c' c,8 r c r
                c32 c' c, c' c, c' c, c' c,8 r c r
                c32 c' c, c' c, c' c, c' c,8 r c r
                c32 c' c, c' c, c' c, c' c,8 r c r
                c32 c' c, c' c, c' c, c' c,8 r c r
                c2.\fermata \bar "|."
                }
            >>
    >>  >> }

The operas of Carl Maria von Weber, particularly Der Freischütz and Euryanthe, featured many passages using this chord. The Wolf's Glen scene in Der Freischütz (1821) is an example.

Wolf's Glen music from Der Freischütz (orchestra only)

According to his early biographer, Alexander Wheelock Thayer,[16] Ludwig van Beethoven spoke disparagingly of the 'accumulation of diminished seventh chords' in Euryanthe (1823).

Beethoven was himself rather fond of the chord and was well aware of its dramatic potential. Perhaps the clearest instance of the diminished seventh's power to evoke mystery and terror can be found in the passage linking the two final movements of Beethoven's Appassionata sonata, Op. 57 (1806). The placid conclusion of the andante movement is interrupted first by a slowly rolled diminished seventh arpeggio played pianissimo, followed by the same chord played an octave above in a sharp, stabbing fortissimo.[17]


{
      <<
      \new PianoStaff <<
        \new Staff <<
           \clef treble \key des \major \time 2/4
           \relative c'' {
                <ges bes es>4(_\markup { \dynamic p \italic dim. } <es aes>)
                <des e g des'>2\pp\arpeggio\fermata
                <des' e g des'>2_\markup { \dynamic ff \italic secco }\arpeggio\fermata
                }
            >>
        \new Staff <<
           \clef bass \key des \major \time 2/4
           \relative c' {
                <ges bes>4( <aes c>)
                <bes, des e g bes>2\arpeggio\fermata
                \clef treble <bes' des e g bes>2\arpeggio\fermata \bar "||"
                }
            >>
    >>  >> }

The final movement of Hector Berlioz's Symphonie Fantastique reflects the influence of Weber [18] in its copious use of diminished seventh chords to evoke the spooky atmosphere of a Witch's Sabbath: "a sinister gathering of spectres, monsters and weird, infernal mocking creatures":[19]

Berlioz's Symphonie Fantastique finale, bars 1-4

By the end of the 19th century, composers had used the diminished seventh so much that it became a cliché of musical expression and consequently lost much its power to shock and thrill. By the turn of the 20th century, many musicians were getting weary of it. In his Harmonielehre (1911),[20] Arnold Schoenberg wrote:

Whenever one wanted to express pain, excitement, anger, or some other strong feeling – there we find, almost exclusively, the diminished seventh chord. So it is in the music of Bach, Haydn, Mozart, Beethoven, Weber, etc. Even in Wagner's early works it plays the same role. But soon the role was played out. This uncommon, restless, undependable guest, here today, gone tomorrow, settled down, became a citizen, was retired a philistine. The chord had lost that appeal of novelty, hence, it had lost its sharpness, but also its luster. It had nothing more in say to a new era. Thus, it fell from the higher sphere of art music to the lower of music for entertainment. There it remains, as a sentimental expression of sentimental concerns. It became banal and effeminate.

Symmetry


{
\override Score.TimeSignature
#'stencil = ##f
    \relative c'' {
        \time 4/4
        <gis b d f>1 <aes b d f> <aes ces d f> <aes ces eses f>  \bar "||"
    }
}
The same four pitch classes spelled as four different diminished seventh chords: Gdim7, Bdim7, Ddim7, and Fdim7.

Because a diminished seventh chord is composed of three stacked minor thirds, it is symmetrical and its four inversions are composed of the same pitch classes. Understanding what inversion a given diminished seventh chord is written in (and thus finding its root) depends on its enharmonic spelling. For example, Gdim7 (G–B–D–F) is enharmonically equivalent to three other inverted diminished chords with roots on the other three pitches in the chord:

  1. Bdim7 (A–B–D–F)
  2. Ddim7 (A–C–D–F)
  3. Fdim7 (A–C–Edouble flat–F)

Nineteenth-century composers in particular often make use of this enharmonic to use these chords for modulations. Percy Goetschius calls it the "enharmonic chord."[21]


{
\override Score.TimeSignature #'stencil = ##f
\relative c' {
  \clef treble \key c \major
  <cis e g bes c es fis a>1
} }

 {
\override Score.TimeSignature #'stencil = ##f
\relative c' {
  \clef treble \key c \major 
  \once \override NoteHead.color = #red des8 \once \override NoteHead.color = #blue es \once \override NoteHead.color = #red e! \once \override NoteHead.color = #blue fis \once \override NoteHead.color = #red g \once \override NoteHead.color = #blue a \once \override NoteHead.color = #red bes \once \override NoteHead.color = #blue c
} }
Two diminished seventh chords in the octatonic scale (one red, one blue) may be rearranged as the alpha chord

As a result of the symmetry of the chord, there are only three distinct diminished seventh chords, ignoring enharmonic spelling, the other nine being enharmonically equivalent to those three. Using Piston's incomplete-ninth analysis discussed above, a single diminished seventh chord, without enharmonic change, is capable of the following analyses: V, V/ii, V/III (in minor), V/iii (in major), V/iv, V/V, V/VI (in minor), V/vi (in major), V/VII (in minor). Since the chord may be enharmonically written in four different ways without changing the sound, the above can be multiplied by four, yielding a total of forty-eight possible interpretations.[22] More conservatively, each assumed root may be used as a dominant, tonic, or supertonic, giving twelve possibilities.[23]

The octatonic scale (or diminished scale), a symmetric scale, may be conceived of as two interlocking diminished seventh chords, which may be rearranged into the alpha chord.

Diminished seventh chord table

Chord Root Minor third Dim. fifth Dim. seventh
Co7 C Edouble flat (D) Gdouble flat (F) Btriple flat (A)
Co7 C E G Bdouble flat (A)
Co7 C E G B
Do7 D F (E) Adouble flat (G) Cdouble flat (B)
Do7 D F A C (B)
Do7 D F A C
Eo7 E G Bdouble flat (A) Ddouble flat (C)
Eo7 E G B D
Eo7 E G B D
Fo7 F Adouble flat (G) Cdouble flat (B) Etriple flat (D)
Fo7 F A C(B) Edouble flat(D)
Fo7 F A C E
Go7 G Bdouble flat (A) Ddouble flat (C) Fdouble flat (E)
Go7 G B D F (E)
Go7 G B D F
Ao7 A C (B) Edouble flat (D) Gdouble flat (F)
Ao7 A C E G
Ao7 A C E G
Bo7 B D F (E) Adouble flat (G)
Bo7 B D F A
Bo7 B D F A

See also

References

  1. Shirlaw, Matthew (1900). The Theory of Harmony, p. 86. ISBN 978-1-4510-1534-8. "G–B–D–F."
  2. Benward & Saker (2003). Music: In Theory and Practice, Vol. I, p. 219. Seventh Edition. ISBN 978-0-07-294262-0.
  3. Fétis, François-Joseph and Arlin, Mary I. (1994). Esquisse de l'histoire de l'harmonie, p. 139n9. ISBN 978-0-945193-51-7.
  4. Schoenberg, Arnold. Harmonielehre, chapter IX, Wien, Universal Edition, 1911
  5. Piston, Walter (1962). Harmony (3rd ed.). New York: W. W. Norton. p. 191. ISBN 0393097374. OCLC 2082824.
  6. Salvador, Sal (1985). Chordal Enrichment & Chord Substitution. Pacific, Missouri: Mel Bay Publications. ISBN 0871665271. OCLC 21109944.
  7. Schenker, Heinrich (1954). Oswald Jonas (ed.). Harmony. Translated by Elisabeth Mann Borgese. Chicago: University of Chicago Press. p. 192. OCLC 280916.
  8. Christensen, Thomas Street (2004). Rameau and Musical Thought in the Enlightenment, p. 100. ISBN 978-0-521-61709-3.
  9. Tenzer, Michael and Roeder, John (2011). Analytical and Cross-Cultural Studies in World Music, p. 157n10. ISBN 978-0-19-538458-1.
  10. Kitson, C. H. (2006). Elementary Harmony, p. 43. ISBN 1-4067-9372-8.
  11. Coker, Jerry (1997). Elements of the Jazz Language for the Developing Improvisor, p. 82. ISBN 1-57623-875-X.
  12. Benward, Bruce & Saker, Marilyn (2009). Music: In Theory and Practice, Vol. II, pp. 220-222. Eighth Edition. ISBN 978-0-07-310188-0.
  13. Kostka, Stefan and Payne, Dorothy (1995). Tonal Harmony, p. 435. Third edition. McGraw-Hill. ISBN 0-07-300056-6 "The cto7 chords... embellish [the] dominant chord. While the cto7 chords are clearly ornamental, their flavor is crucial to this passage and to the waltz that follows."
  14. Alchin, Carrie Adelaide (1917). Applied Harmony, p. 99. Los Angeles: C. A. Alchin. [ISBN unspecified] .
  15. Cone, Edward T. (2009). Hearing and Knowing Music. Princeton: Princeton University Press. p. 109. ISBN 9781400830466. OCLC 670430565.
  16. Thayer, A. W. (1921) Life of Beethoven. Princeton: Princeton University Press (1879)
  17. Rosen, C. (2002, p. 196) Beethoven's Piano Sonatas, a Short Companion Yale University Press.
  18. Hovland, E. (2019, p. 20) "Who's afraid of Berlioz?" Studia Musicologica Norvegica, vol 45, no. 1, pp. 9–30.
  19. Macdonald, H. (1969, p. 37) Berlioz Orchestral Music. London, BBC.
  20. Schoenberg, Arnold (1911) Harmonielehre, Wien, Universal Edition.
  21. Goetschius, Percy (1913). The Material Used in Musical Composition: A System of Harmony. p. 159, G. Shirmer, Inc.
  22. Piston, Walter (1962). Harmony (3rd ed.). New York: W. W. Norton. p. 201. ISBN 0393097374. OCLC 2082824.
  23. Adela Harriet Sophia Bagot Wodehouse (1890). A Dictionary of Music and Musicians: (A.D. 1450–1889), p. 448. Macmillan and Co., Ltd.
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