About a year and a half ago, I wanted to put some LEDs in a clear guitar. This has been done before, but I wanted to give it a try and see if I could come up with something really cool. I bought a clear guitar, put USB controlled LEDs into it and plugged it up to my computer before I found out: No one has any tone-based algorithms to convert sound into color! What did I do? I invented ColorChord (TM).

Source: Charles Lohr’s Blog: ColorChord Sound Lighting