In August 2004, he temporarily joined the alternative rock band Muse at the V Festival, filling in for bassist Christopher Wolstenholme who had broken his wrist playing football.

[2] In 2004, Morgan Nicholls joined Damon Albarn to play bass guitar on the 2005 Gorillaz album Demon Days.

In 2005 and 2006 he joined the Gorillaz live band for a live set of show for Demon Days, playing two 5 night residencies at the Manchester Opera House in Manchester and the Apollo Theater in Harlem, New York.

[4] In late 2018 [citation needed], Nicholls, Cass Browne, Ade Emsley and Des Murphy, formed a psychedelic-punk band, Circle 60.

[6] Touring members: Morgan Nicholls (2004, 2006–2022), Daniel Newell (2006–2008), Alessandro Cortini (2009), Dan Lancaster (2022–present)