Hey,
I've created a quiz where you have to identify themes of the classical standard repertoire. On higher levels there will be some nice extras as bass lines or figured bass samples.
The game is in German, but it's easy to understand: If you've recognized the piece, just enter the composer's surname (as it is written on the German wikipedia, e.g. Tschaikowski (instead of Tchaikovsky)) and the Opus number, with a few exceptions: for Mozart, use the K. number, for Schubert D. and for Bach BWV, Handel HWV.
If your entry is correct, you'll pass to the next level.
If you don't know further, you can enter your name into the highscore. If you reach a higher score, you'll be able to enter again and it will overwrite your old entry.
Enjoy!