Audiosurf is probably the best audio analysis engine we have. While it doesn’t go in-depth into the track, the reason it wins is because it has GAMEPLAY!
You can tell me all you want about some other software or “game” that can analyze my music, and I’ll follow-up that it probably has little to no gameplay at all.
That said, Audiosurf is a comprehensive community based game. It has an entire music rating system, leaderboards, and new music every week.
I would advise you to pick it up, you’ll have quite a bit of fun with it.