What are some alternatives?
When comparing Audiosurf and Rez Infinite, you can also consider the following products
Rocksmith - Rocksmith builds off of the fundamentals of music games like Rock Band and Guitar Hero by offering fundamental lessons in actually playing guitar.
Frets on Fire - Bonus content.
Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
Incredibox - Express your musicality, pump it up and chill
StepMania - Rhythm game for Windows, Mac, and Linux.
Symphony - Symphony transforms the way users communicate effectively and securely with a single workflow application.