Les B., Glenn Gould. Maybe he figured it would warm up the muscles etc. and make them more limber, I don't know. I'm often tense when I first pick up the guitar and it takes a while to warm up and relax into the sounds I'm making. I play and sing better onstage or off if I've taken the time to warm up instead of just belting straight into something difficult. Of course, just like everyone else, even with all that I still have days when it ain't working. The worst was earlier this summer when I didn't know what was wrong with my voice, no matter what I did, (sleeping, staying away from alcohol and caffeine) it just got weaker and rougher. Finally I went to the doctor who told me within 5 minutes I had strep throat. I should have gone to her a week earlier instead of simply asuming I was having a couple of rough days...