It would affect my performance just WATCHING someone drink a fifth of vodka and try to play!
However, I opened a show for Ray Price once, and two guys had to help him on stage, each holding one arm. I thought he'll never finish the first song, but he did a great show and never missed a note. Then they had to help him off stage. That was 35 years ago. He was no doubt partaking off grass and not booze though.
That must have been an epic amount of weed to need lifting on stage..! I'd say it's a lot more likely to be a combination of pills and booze. That was the anesthetic of choice back in those days!
