And while there will be plenty of never-before-told stories from throughout his life, he's aiming to avoid idle gossip and produce an honest memoir like David Bowie's.

Keenan tells Rolling Stone: "Most people want to hear the kiss-and-tell crap, the garbage on the bus. That's boring to me. 'We threw a piano out a window.' That's been done a million times before even Buddy Rich was around.