Having seen alcohol mentioned, I will pass my comments. I have never had any problem playing with anybody who has had a couple of pints (unlike those who have smoked a joint).

Personally, I do find that I play better after a couple of pints that I do when completely sober but from then on, my playing does go down hill. I am quite a hardened drinker and have been know to play after 10+ pints and seem to be OK (I have listened to recordings) provided I carry on playing while drinking - if I stop and try to get back in after that quantity, I fail dismally.

I would not advocate drinking in the way that I do but I would suggest that depending on the person, 1/2 a pint to perhaps 2 pints can be helpful as it can help overcome and doubts, nerves etc. Please don't get me wrong though - if these person can overcome these problems without the use of alcohol, they are better off.

Jon