Rocketry: The Nambi Effect (soundtrack)

In April 2019, Madhavan announced that Sam C. S. would compose the score for Rocketry: The Nambi Effect; he previously scored for Vikram Vedha (2017), which also starred Madhavan in the lead.[3] Upon Sam's inclusion, Madhavan stated that "he could provide character building with respect to the film's background score, which he demanded, especially for a biopic about Nambi Narayanan".[4] Sam said that the "overall music of the film needed a western color, as it is an English film, and while it had an Indian ethnic feel, it also needed a westernised orchestral score",[4] as the film was predominantly shot in foreign countries.[5] He also stated that, as the film takes places from the 1980s to the 2000s, the score will also "have a touch to the music of those time periods".[6] The score was recorded much before the films shooting, and Madhavan felt it easier to place those songs to see the effectiveness of it.[4]

Sam worked with the Macedonian Symphonic Orchestra during October 2020 for recording the live orchestral music.[7] Despite the pandemic restrictions, the orchestration team led by Michael Hyman and sound engineer Jim Satya, arranged a 72-piece orchestra for the film.[4] To achieve the westernized feel of the music, Sam had blended rock and contemporary music into the orchestra.[4] The orchestral sessions took place at the Los Angeles. In an interview to The New Indian Express critic Chandini S, Sam had said that fitting the film's music to the setting (as it takes place in various continents) was a challenge in itself.[8] He added "There were a few sequences set in Russia at the time when it was still the USSR (Soviet Union). So, we did a bit of research and found the national anthem of that period. We have recreated it for the establishment scene. Likewise, for scenes set in France, we found popular songs of that period and recreated them."[8] Sam added the film will have original songs in the background, which will be played in a car or on a radio, as similar to that of Hollywood films.[6]

The first song to be recorded, was the rendition of the Sanskrit poem Suprabhatam featured in the film. It was arranged and produced by Divakar Subramaniam, who attributed the song to be soft and gentle, like "awakening the lord" and a nascent and pure version from the heart. Subramaniam went to several temples around Chennai and Tirupati, and had met several religious scholars as a part of his research.[4] Madhavan stated that, the Suprabhatam is played in the beginning of the film, where "beyond from the universe there is an absolute emptiness, and the only existing thing is the supreme being and from there, the universe slowly converges to the planet earth, and then it showcases into Nambi Narayanan's house and his altar where he is seen praying".[4] It is to show that, "there is a universe that is oblivious to what is happening on earth, but the universe of Narayanan, on that day, is going to get completely destroyed".[4] And he felt auspicious to begin with that, to feel a positive impact before the "devastation happens and hits him [Narayanan] harder".[4]

The film has two original songs, featured in the film: "And It Hurts" and "Through Thick and Thin". Nate Cornell and Billy Dawson, country musicians hailing from Tennessee, composed and also sang the respective tracks. Cornell co-wrote the lyrics for the former, with Terell Davy, whereas Dawson wrote "Through Thick and Thin" through WhatsApp text message with Madhavan; they intended to not have linguistic barriers between "a Texan and an Indian", as a result, both the songs were recorded in six different languages.[9][10]

On 17 June 2022, as a part of the film's promotions, Madhavan, the co-producer Vijay Moolan, along with composer Divakar Subramaniam went to Sri Venkateswara Temple in Tirupati, to release behind-the-scenes video of the film's music as well as the release of the "Sri Venkateshwara Suprabhatam".[11][9] On 24 June, the film's music album was released in Tamil, and Hindi languages, featuring the two songs and instrumentals composed by Sam C. S.[12]

The music by Sam C. S. was positively received with Pratikshya Mishra of The Quint,[13] and Srinivasa Ramanujam of The Hindu,[14] mentioning it as "one of the film's highlights". Janani K. of India Today also praised the Sam's music "magically makes you feel different emotions",[15] while DT Next-based Vijaya Shankar called it as "decent" and "shifts to suit the mood of the film".[16] Behindwoods opined that Sam CS' background score is "another backbone of the film" and wrote "He amplifies the dramatic portions well and makes sure the scenes are impactful, while the scenes where Nambi achieves a lot of things, the score becomes more rousing. His work is solid and makes the film far better than what it should have been."[17]

Koimoi-based Umesh Punwani wrote "The music is moving but also a bit extra in some parts. Can’t deny Behne Do (And It Hurts) is placed in a way to churn out emotion and it does that successfully."[18] Bollywood Hungama criticised the film's two songs as "it fails to make the mark", but opined that the Suprabhatam is well woven into the film, and Sam CS' music " is exhilarating and enhances impact in several scenes".[19]