In fact these drugs, be they illegal or legal, are not 'performance enhancing' at all, they merely enhance the performer's perception of his performance. He thinks he's playing brilliantly, but his audience (or those in his audience with clear, un-intoxicated brains) know he's playing crap.

I've never heard anyone play better because they're stoned or pissed, always the opposite. Perhaps the thread should have been titled 'Musicians and performance-affecting drugs'.