The rock legend, who is currently touring the UK with Them Crooked Vultures, explained he became aware of the campaign in the early hours on the way to a gig.

He enthused to Rock Radio: "We were on our way here and we stopped at a rest stop. It was 4.30 in the morning, I hadn't slept all night and there was nobody in there except the one guy who works at the sandwich stand.

"I was paying for my sandwiches and he said, 'Are you going to buy the Rage Against the Machine single this week?'

"I said, 'Yeah, I think I might have to!'

"There's some music that I question for its intention. I think when people rise up and decide, hey man, I'm sick of this, let's derail this other thing for something real - I'm all for it.

"It's an incredible song and it's meaningful - maybe people are craving something that actually means something."

Grohl joins The Prodigy (1), Hadouken!, Enter Shikari and the Stereophonics (2) in endorsing the Facebook campaign.

Don't forget, supporters of the Rage Against the Machine campaign can donate to the charity Shelter HERE.

(by Scott Colothan)