The group is a collaboration of Brooklyn-based musicians Lila Ramani (guitar, vocals), Jesse Brotter (bass, vocals), Bri Aronow (synthesizers, keyboard, saxophone), and Jonathan Gilad (drums), who met while attending Tufts University.

[1] Ramani, Brotter, Aronow, and Gilad met at Tufts University, often living and playing together until 2016, when they developed and recorded a collection of songs Ramani had started writing in high school and college.

Crumb went on to release their debut full-length album, Jinx, on June 14, 2019.

Indie Current described Crumb's sound on Locket as psychedelic slacker-rock.

[10] Paste magazine called their sound a meld of "60s psych, loose jazz, and freeform indie rock into a soothing pop amalgamation."