The most violent, explosive running feuds in rock bands are between brothers: Ray Davies and Dave Davies of the Kinks, Chris and Rich Robinson of the Black Crowes, Noel and Liam Gallagher of Oasis. It makes sense if you think about it: if you’re the leader of a successful group, your world is groupies, peeled grapes and color-sorted M&Ms. But while everybody around you, down to the drummer, is deferring to you and your artistic whims, there’s one guy in the band who not only isn’t snapping to attention, he knows exactly what to say to wind you up. And that’s how fights start onstage.