From 1990–95 Marsden played guitar in London art-punk collective The Keatons, who were played by Peel and notably supported Blur on their first tour of the UK but were thrown off for unprofessional conduct – as documented in Blur's biography, 3862 Days. He also sang with Gag, who recorded a Peel Session in 1993 – although Marsden had an earlier run-in with John Peel at the age of 17 when his fanzine, Glottal Stop, was the subject of a piece on Peel's show on BBC Radio Cambridgeshire in 1988.