What is the name of the tune that Schroeder plays on the piano in the Charlie Brown's cartoons?

"Linus and Lucy"
http://en.wikipedia.org/wiki/Linus_and_L...

Virtually all the music Schroeder plays is classical: Mozart, Bach, and his favorite, Beethoven. Occasionally, a John Philip Souza march will appear.

It depends on which cartoon you're talking about, though. He plays different songs in different cartoons. Can you clue us in...?

The one piece Schroeder plays most is "Fur Elise." Most of the music he plays is Beethoven, the reason being that Charles Schultz the cartoonist was a huge Beethoven fan.