There Summers attended Woodbridge School,[5] had piano lessons and grew an interest in music, crediting some influence from mixtapes made by her father with "a very eclectic mixture of everything and anything from Beethoven to Bob Dylan, rarities, poetry, even the Shipping forecast".

[6] Hip-hop was a preferred genre, as her neighbours gave her a tape with Snoop Dogg's Doggystyle (1993) and 6 Feet Deep (1994) by Gravediggaz, and she would also spend evenings with fishermen's sons "who smoked loads of weed and listened to hard American rap.

While there, she bought a set of DJ mixers to learn how to mix, while also doing side jobs such as being a courier for Top of the Pops and transcriptions and film digitizing for Alan Parker.

One day, as Summers got into a creative rut, which she described as getting "sick of boys telling me what to do", she thought of writing pop music with a woman, and invited Welch to make songs with her.

[11] Summers has also written, produced and remixed tracks for artists including Beyoncé, Juliette Lewis, Jennifer Hudson, Jasmine Thompson, Cara Delevingne, Chloe x Halle, Flux Pavilion, Rita Ora, Judith Hill, LP and The Game.

[12][13][14][15] Summers had created the main title song "Was It Love" for the Sky Atlantic series Riviera,[16] and provided her friend Sam Levinson the song "Rage" for his film Assassination Nation (2018),[17] when right after finishing the High as Hope Tour, that film's music supervisor Mary Ramos invited Summers for her first composing gig in a team-up with Mark Isham, scoring the Hulu miniseries Little Fires Everywhere,[18] which won her a Primetime Emmy Award nomination.

[24] In 2022 Summers scored Sony's 3000 Pictures and Netflix film Lady Chatterly's Lover, directed by Laure de Clermont-Tonnerre and starring Emma Corrin and Jack O'Connell.

In 2023 Summers scored the Apple TV+ adult animation series Strange Planet by Dan Harmon and Nathan W. Pyle released on August 9, 2023.

[26] In 2023, Summers scored the soundtrack for the Focus Features film Lisa Frankenstein, directed by Zelda Williams released February 2024.