Music mogul Rick Rubin has always refused to take drugs, insisting music is all he needs to transport himself to another level. The Def Jam boss has watched leading figures in the music industry spiral into substance abuse in their bid to find a deeper understanding of their work. But Rubin has never needed any assistance when it comes to getting into the groove. He says, "I have an ability to focus on music and not much else. "I've never taken any drugs in my life, never been high. "So music has always been my other world, the way I've connected to other realms."