Dave Grohl has praised Billie Eilish for starting what he calls a rock’n’roll “revolution”.The Foo Fighters frontman said in a new interview that rock music is a “different game” now for younger acts but is certainly still relevant, after a line from his band’s new horror-comedy film Studio 666 touched upon the “rock is dead” trope.The Independent quoted a line that Jeff Garlin’s character says in the movie about the current music climate (“Rock’n’roll, it hasn’t been relevant for a long time”).“Well, I think you have to define ‘relevant’,” Grohl responded. “It’s hard for us to say that rock’n’roll is in a rough patch, because we get up on stage and there’ll be thousands of people fucking going bananas and singing along to our songs.”But he acknowledged that there’s been a shift in how rock music is received.