With just one musician, you can really do an unlimited number of things on the inside of the piano, if you have at your disposal an exploded keyboard.
John CageWhen you start working, everybody is in your studio- the past, your friends, enemies, the art world, and above all, your own ideas- all are there. But as you continue painting, they start leaving, one by one, and you are left completely alone. Then, if you are lucky, even you leave.
John Cage