This is taken from the official website of Synthesia:
Synthesia is a game that teaches you to play the piano using falling notes. No sheet music reading is required. With it, you can:
- Learn to play songs using a musical keyboard connected to your computer.
- Keep track of your progress in every song with per-song scoreboards.
- Slow, fast-forward, and rewind songs while learning new parts.
- Practice left and right hand parts together or separately.
- Try out any MIDI file you can find on the Internet.
WindowedSynthesiaLauncher launches the game so that it doesn't go full screen, allowing you to perform other tasks while Synthesia is running.
Synthesia screenshot (original source)
Downloads