This is phenomenal. My senior project at Stanford was a Dance Dance Revolution game that could take MP3's and turn them into playable DDR steps. But I have to say, it didn't work nearly as well as what the JamLegend
guys have done. I just uploaded one of my favorite rap songs to JamLegend. They processed the file, extracted the beats and melodies of the song, and made a playable song based on it.
What's even cooler is you can now play JamLegend just like RockBand / Guitar Hero, with your real guitar. There are instructions on how to set this up
for both Mac/PC for GH/Rock Band controllers for all platform controllers PS3, Wii and Xbox 360.
And you can duel your friends online (multiplayer) without ever even being in the same room.
OK, so lets review: JamLegend has created Guitar Hero that a) is super fun multiplayer Flash web game with no download, b) works with any guitar controller you may have lying around, and c) lets you upload any song you want and it will work awesome.
You should play jamlegend here