There was a sketch/routine with a British Comedian who was playing the piano. I really can't remember that much about it. I'm sure he used someone from the audience (who was obviously a stooge)
It was probably about 15 years ago. I thought it was Richard Digence
Anyone got any ideas or may have sen it on youtube?
I've seen Rick Wakeman do it at a live gig. He's not a comedian per se, but his one man show is very funny. He got a woman from the audience and told her to play a single note on a keyboard when he said, because he wouldn't be able to get across the stage in time. What he didn't tell her was that he'd set it up on a sustain programme so that it carried on even when she released the note.