Ever since the Black Keys have made their first steps into rock superstardom, first with 2010's Brothers and now with December's hit release El Camino, the Ohioan band haven't been afraid to speak out against those who grind their gears. A couple of weeks ago Nickelback were the source of the band's ire, as drummer Patrick Carney spoke out against the group - who many perceive to be the world's best rock band - being shit, before apologising last week.

Now it appears that Napster founder and Spotify board member Sean Parker is the latest on their hitlist. Carney, who is fast approaching a reputation as 'the mouthy one' in the group said of him to US radio station WGRD: "He's an asshole. That guy has $2 billion that he made from ways figuring out ways to steal royalties from artists, and that's the bottom line. You can't really trust anyone like that."