He tells Rolling Stone: "People always want to know what we're doing. I understand that. The music business is generally one in which people make plans far in advance, and they don't veer from their plans.

"But with Bruce, it's just simply that he writes songs, he makes an album and then he figures out where he wants to go and play. There's always some plans in the mix but until he says, 'The album is done, let's go,' I don't ever really know.