Russell Brand has a prescription for the ailing music industry — heroin. The British comic, fiancé of Katy Perry, tells Rolling Stone: “The top of the hit parade would look very different if teenyboppers were exposed to heroin. It would weed a lot of them out. I don’t think Justin Bieber could handle [Pink Floyd member and heavy user] Syd Barrett’s habit . . . A lot of people in their journey to rehab overdose, and then, perhaps, we would be spared their awful music. It’s Darwinian. It’s the law of natural selection.”