Punk pioneer Sean Bonniwell has lost his battle with lung cancer at the age of 71.
The Los Angeles songwriter, who led short-lived but influential 1960s garage band Music MAChine, was dubbed the grandfather of punk after his group inspired the California punk scene of the late 1970s with hits like Talk Talk.
Bonniwell died on 20 December (11).
His life was chronicled in the well-received autobiography Unknown Legends.
The movie begins filming in the UK.
The 'Sherlock' and 'Doctor Strange' star joined Gilmour onstage at the Royal Albert Hall for a rendition of the Pink Floyd classic.