I have played in bar bands for years, and many of my band mates have been heavy drinkers. Many times I’ve heard that they play much better when they’ve been drinking. As for me, I found out very quickly that my fingers won’t cooperate if I even have just one beer, so I never drink when I’m playing! As for my band friends, they think they’re playing better, but as the only sober player onstage, I can attest to them being quite wrong!