Gustave Chand Rudman Rambali is a Franco-Swedish record producer, songwriter, composer, arranger and orchestra conductor. He is the former vocalist and guitarist of the group Naast,^[1][2] and has arranged or produced music for artists including Kanye West, Woodkid, the Weeknd, and Labrinth.^[3][4] He has since composed music for soundtrack of the HBO series Euphoria,^[5][6] as well as the 2021 documentary Tranchées [uk], which was selected at the 78th Venice International Film Festival.^[7] In 2022, he composed original music for fashion shows by Balenciaga^[8] Alaia^[9] and Gucci. He worked with Kanye West and Ty Dolla Sign on their collaborative album Vultures 1 (2024), as a producer and songwriter on its title track.

Rambali is the son of Paul Rambali, a British rock critic from NME and editor of The Face. He was born in Paris, France and began learning piano as a child at his local conservatory. Aged 20, he enrolled at the Schola Cantorum de Paris.^[10] From there, he was admitted to the Conservatoire National Supérieur de Musique et de Danse de Paris^[11] where he studied composition and orchestration. In 2013, he received from the CNSMDP the Prix d’harmonie, and in 2015 the Prix d’écriture XX-XXIème.^[12][13]

In 2004, as Gustave Naast, he formed the group Naast with members Jeff Brakha, Nicolas Ballay and Lucas Sensi.^[14] His song Mauvais Garçon from their debut album Antichambre was featured in the video game Guitar Hero III: Legends of Rock.^[15] In 2008, he disbanded the group to pursue his classical music studies. Later in the year, he composed the music for the animated children's TV series Podcats.

In 2007, after a concert in Bordeaux, he assaulted the member of another French rock band with a fork, causing a serious eye injury. He was sentenced to 10 months in prison (suspended) in 2010.^[16]

In 2011, his arrangement of the song Iron by Woodkid marked his career debut as an arranger and producer.^[3] The arrangement was later sampled by Kendrick Lamar for The Spiteful Chant. Whilst continuing his studies, he composed, arranged or produced music for artists including Clean Bandit, The Weeknd, Birdy and LSD (a supergroup comprising Labrinth, Sia and Diplo). In 2015, he did arrangements for Losers on The Weeknd's Grammy award-winning album, Beauty Behind The Madness.

In 2017, he composed the soundtrack of Atacama, a short film directed by French contemporary artist Caroline Corbasson.^[17] In 2019, he composed music for the HBO series Euphoria, directed by Sam Levinson.^[18] In 2021, he composed the original soundtrack for the documentary Tranchées which had its out of category world premiere at 78th Venice International Film Festival.^[7] In 2022, he was invited by fashion brands Balenciaga^[19] and Alaia^[20] to compose the music for their haute couture shows at the Paris Fashion Week.