When I was in college we celebrated one year with a cake in the shape of a piano, in the Student Union. People thought we were nuts. They were right.

Oh, Ludwig, it's your birthday
It's your birthday, Luddy dear
Only one birthday per person
And yours has come around this year.
There is nothing that can stop it
No matter what or how you try,
It's your birthday, Lud Beethoven --
We hate to see a grown man cry.

          - to some of the Choral Part of you-know-who's 9th Symphony