There's one in the banjo jokes thread that mentions accordion players also. In fact you could just substitute accordion for banjo in most of those jokes.

There's also a Gary Larson Far Side cartoon - a group of new arrivals in heaven being handed harps with the angel (presumably St. Peter) saying "Welcome to heaven...Here's your harp." Then in the lower half of the frame, a group of new arrivals in hell, with the devil saying "Welcome to hell...Here's your accordion."