Simpson was an accomplished drummer, winning the 'Young Drummer of the Year' award in 2014.

Prior to the formation of the band, Geordie Greep had separate jam sessions with Matt Kwasniewski-Kelvin and Morgan Simpson, all of whom (alongside Cameron Picton) were attending BRIT School. History Formation and first singles (2015–2019) Their third studio album, Hellfire, was released on 15 July 2022. The band's second studio album, Cavalcade, was released on. In January 2021, founding member Matt Kwasniewski-Kelvin went on hiatus from the group for health reasons. 1: Tales of Suspense and Revenge, was released on 5 June 2020 exclusively to Bandcamp. An anthology album including several recorded jams and spoken word tracks, The Black Midi Anthology Vol.

It received critical acclaim, entered the top 50 of the UK Albums Chart, and was nominated for the 2019 Mercury Prize. They released their debut studio album Schlagenheim, produced by Carey, on 21 June 2019, through Rough Trade Records. The band began on producer Dan Carey's record label Speedy Wunderground, through which they released their debut single 'bmbmbm' in 2018.

Their name is derived from the Japanese electronic music genre black MIDI, though their own music has no relation to it, instead incorporating styles such as math rock, progressive rock, post-punk, and avant-jazz. The trio have been frequently joined by Seth Evans (keyboards, synths) and Kaidi Akinnibi (saxophone) in both studio and live performances since 2020. Black Midi (stylised black midi) are an English rock band from London, formed in 2017 and currently consisting of Geordie Greep (vocals, guitar, piano, synths, accordion), Cameron Picton (vocals, bass, synths, flute, guitar), and Morgan Simpson (drums).

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