"A drummer is a musician's best friend." from a Martin Mull album.

A drummer, sick of all the drummer jokes, decides to change his instrument. After some thought, he decides on the accordion. So he goes to the music store and says to the owner, "I'd like to look at the accordions, please." The owner gestures to a shelf in the corner and says "All our accordions are over there." After browsing, the drummer says, "I think I'd like the big red one in the corner." The store owner looks at him and says, "You're a drummer, aren't you?" The drummer, crestfallen, says, "How did you know?" The store owner says, "That `big red accordion' is the radiator."