All sorts of things can go wrong in a performance. A cockroach can scuttle across your pedalling foot (this has happened to me). The music may fall off the stand (this has happened to me). A blood blister on your cuticle may burst during a glissando (you guessed it, this has happened to me). But no matter what happens, as they say, ‘the show must go on’. What is the reason for this? Why do you have to keep going no matter what? Because it’s