Black Midi were an English rock band from London, formed in 2017. Their most recent line-up consisted of lead vocalists and multi-instrumentalists Geordie Greep and Cameron Picton, along with drummer Morgan Simpson. Between 2017 and 2020, the band also included guitarist Matt Kwasniewski-Kelvin. Following his departure, the trio were frequently joined by multi-instrumentalist Seth Evans and saxophonist Kaidi Akinnibi, both as session musicians and during live performances. Their name is derived from the Japanese electronic music genre black MIDI, though their own music has no obvious relation to it, instead incorporating styles such as math rock, progressive rock, post-punk, and avant-jazz.