“I was a nightmare,” he admits, as he’s shown slamming down headphones, snapping at his collaborators, ripping up lyric sheets and, at one point, telling Watt that he’s going to go hom ...

Credit: Left-Harry Durrant/Getty Images; Right-Kevin Mazur/Getty Images for EV Andrew Watt has built quite a name for himself as the go-to producer for rock veterans, working with the likes of The ...