December 16 is the day on which Beethoven's birthday is traditionally observed. But there's a catch: nobody knows exactly WHEN Beethoven was born! The only surviving record (piece of paper....not the vinyl platter than spins on a turntable) is of his baptism, and that was on December 17, 1770. Apparently, in those days, baptisms tended to occur the day after a child's birth, so that's how the December 16th "birthday" came to decided upon. A few interesting Beethoven links to try:
Wikipedia's Beethoven entry.
The Beethoven-Haus in Bonn, Germany (his birthplace).
The American Beethoven Society.
And for the children.....the Classics For Kids page about Beethoven.