Levi studied composition at the Guildhall School of Music and Drama, but left without a degree when their experimental pop band Micachu and the Shapes began to achieve early success.

Levi has also released solo projects under both the Micachu moniker and their given name, and has frequently collaborated with other artists, including Kwes and Tirzah.

[4][8][9][10][11] There, they started an experimental pop band with two friends, keyboardist Raisa Khan and drummer Marc Pell, called Micachu and the Shapes.

[4][11] Performing as a DJ, they also released a mixtape titled Filthy Friends, which was posted on their official Myspace page.

Most of the music prominently featured an acoustic half-guitar with various non-standard tunings, extensive distortion, and use of noise and found-object elements, as well as occasionally unusual time signatures.

In the wake of growing buzz, Micachu and the Shapes were signed to Rough Trade,[15] which released Jewellery on 9 March 2009 to critical praise.

[17][18] In March 2016, the band announced on social media that they were changing their name to Good Sad Happy Bad.

[24] The score was widely acclaimed for pushing the boundaries of music and sound design and Levi was nominated for multiple awards.

[29] In 2016, Levi completed their second major film score, for Pablo Larraín's Jacqueline Kennedy Onassis biopic Jackie.

Composer Ryuichi Sakamoto, also on the jury, was enthralled by Levi's bold score for the film, and he and Larraín spoke passionately of their accomplishment,[24] which led to the collaboration on Jackie.

[32] That same year, Levi scored the science-fiction film Marjorie Prime and, in association with musicians Demdike Stare and Gruff Rhys, contributed to the soundtrack for artist Phil Collins' Ceremony: The Return of Friedrich Engels which was screened at the Manchester International Festival and then broadcast by the BBC.

Later that same year, Levi composed the score for Mangrove, the first, feature-length episode of Steve McQueen's Small Axe series for the BBC and Amazon Studios.

Levi is also known for their various collaborations with English singer and songwriter Tirzah, a close friend they met at Purcell.