Fairy godperson grants you musical mastery overnight: which single instrument would it be?

I'd imagine myself playing the piano. I've always been told I have "piano hands", but can't even read music... It can be played in so many ways, from clical to rock, and it's always cool to be able to walk up to an unused piano and be able to knock off a song for the crowd... Carrillon is a close second (you know, the tower bells?)... Imagine half a city being able to hear you play!!!!!!