In a class recital I played Scriabin op.8 no. 12 with a cold and couldn't hear out of my left ear...yet my teacher praised the performance afterwards saying, "you should play with a cold more often..."Huh.your friendRob
I think a fart can easily be drowned out by the music(unless it's extraordinary loud)
Also, you can try saying "watermelon." It stops a sneeze, for some odd reason.
Well, if you wanted help winning a competition, you could let one out carefully so it doesnt make any noise (SBD - Silent, but deadly) just as you are getting up from the piano bench and the next competitor is on their way to the piano. haha and then they will sit there like, :-/lolololololololololoololololololol