Matt Kwasniewski-Kelvin

Matthew Antony Kwasniewski-Kelvin (8 February 1999 – 12 January 2026) was an English musician and lead guitarist of the rock band Black Midi from its foundation until his departure in 2020. The group were a part of British rock music's Windmill scene.

Kwasniewski-Kelvin recorded one studio album with the band, Schlagenheim (2019), before departing the following year due to mental health difficulties. Prior to his departure, Kwasniewski-Kelvin contributed to the writing process for the band's second studio album, Cavalcade (2021), and later contributed to recordings by Greentea Peng and Wu-Lu.

Early life Kwasniewski-Kelvin was one-quarter Polish. As a child, he was a fan of pop-punk and classic rock. He cited his father's CDs and records as how he started listening to music from a young age, along with YouTube. His father's collection featured Bruce Springsteen and Eric Clapton. Prior to his departure, Kwasniewski-Kelvin contributed to the writing process for the band's second studio album, Cavalcade (2021), and later contributed to recordings by Greentea Peng and Wu-Lu.

Death and legacy Kwasniewski-Kelvin died by suicide in January 2026.

In 2026, British newspaper The Guardian stated "Kwasniewski-Kelvin helped to make Black Midi into one of the most talked-about, musically adventurous rock bands in recent years".

Discography With black midi: Singles "Crow's Perch" (2019) "Talking Heads" (2019) "7-eleven" (2019) "Sweater" (2020) Studio albums Schlagenheim (2019) The Black Midi Anthology Vol. 1: Tales of Suspense and Revenge (2020) Live albums Damo Suzuki Live At The Windmill Brixton With 'Sound Carriers' Black Midi (with Damo Suzuki) (2018) Live at KEXP (2019) Live on Canal St, NYC (2019) Live in the USA (2020) As featuring artist: "Mixed Messages" - Rosie Alena (2019) Man Made - Greentea Peng ("This Sound") (2021) Loggerhead - Wu-Lu (2022) "General Behaviour" - Tedd Maul (2026) As solo artist: Singles "Paedophile Ring (Free Palestine) (End the Holocaust) (End the War Now)" (2024)