Suspended cymbal
A suspended cymbal is any single cymbal played with a stick or beater rather than struck against another cymbal. Common abbreviations used are "sus. cym.," or "sus. cymb." (with or without the period).
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Most drum kits contain at least two suspended cymbals: a crash cymbal and a ride cymbal.
History
The term comes from the modern orchestra, in which the term cymbals normally refers to a pair of clash cymbals. The first suspended cymbals used in the modern orchestra were one of a pair of orchestral cymbals, supported by hanging it bell upwards (i.e., with concavity opening downward) by its strap. This technique is still used, at times, but has largely been replaced by specialised cymbals with larger mounting holes that can be mounted on a cymbal stand.
Occasionally the term suspended cymbal is still used in the original sense of one of a pair of orchestral cymbals hung by its strap, and this is the usage in older scores and may be the wish of modern conductors in playing them. It is essential to check this before committing to a particular technique.
Technique
In an orchestral setting, suspended cymbals are most often used for rolled crescendos, or swells. To do this, the percussionist uses a single-stroke roll on the outside edge of the cymbal, using soft mallets, one on each side. The terminology most commonly used to describe this technique is a suspended cymbal roll. At times, a score also calls for hitting the cymbal with a stick or scraping it with a triangle beater. Other techniques utilize the bow of a contrabass, to be drawn slowly across the outside rim of the cymbal. This technique will give a very shrill, eerie sound, particularly useful in film music. Another lesser-known technique is to place a suspended cymbal upside down on a timpani head. The timpanist is instructed to roll ad lib on the suspended cymbal while moving the timpani pedal up and down as a glissando. Film composer Danny Elfman has made great use of this technique, which needs to be performed in a more "transparent" orchestral setting to be heard.
Other composers will use a sample, or recording, of the cymbal struck by a mallet with a long, natural decay. They will then play that segment backwards, so the effect heard is a crescendo to a crisp cutoff of the sound. This is used to great effect for film and pop music, and even to punctuate scenes in many so-called reality television shows.
Other uses
In a drum kit, nearly all the cymbals used are suspended cymbals in the broadest sense, the main exceptions being pairs of hi-hat cymbals.