What are some alternatives?
When comparing Flash Flash Revolution and Guitar Hero, you can also consider the following products
StepMania - Rhythm game for Windows, Mac, and Linux.
Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
VOEZ - VOEZ invites you to embark on the remarkable journey of teenage dreams
Frets on Fire - Bonus content.
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
McOsu - A free open-source circle-clicking rhythm game practice client for osu!