Then there's the mystery prompter. I'm still looking for the guy who "lined" me when I dried halfway through I Don't Believe You've Met My Baby, at Chorlton one night - I tried to thank two or three people, but they all denied all knowledge. If you're reading this, whoever you are, thanks for that.

Tunes, in my experience, are even worse - there's being able to play a tune, then there's being able to play it without thinking, and then there's being able to let your fingers play it while you think about something else. Playing in public, I find, draws a very definite line between tunes in the third category and everything else - if I can play it blindfold while planning meals for the next week in your head, then I can play it in public, but if not I'm left scrambling after the dots.