I want to point out a bug in this game which is rather important to know about:
When you close the game, be sure to press CTRL-ALT-DELETE and check to see if Synthesia is still running. I didn't notice that it didn't close properly and my CPU was running at 100% for days (this game uses every bit of available CPU power), wasting electricity and generating excess heat (not to mention the wear and tear on my CPU!).
Just a warning for everyone. When you close the game, make sure it actually closes. B)