Found this topic when browsing through the forums.
Just wanted to add the fact that Frequency, Amplitude, Guitar Hero 1 & 2 and Rock Band 1 & 2 (Notice Guitar Hero 3 and World tour are NOT in this list) are all made by Harmonix. They are a small (well... getting bigger, but still "small" compared to monsters like EA and Activision) game company that was founded by two MIT grads that wanted to bring music to more people through video games. They are definitely accomplishing their goal.
My girlfriend is listening to music more critically after playing through Guitar Hero and Rock Band since she now pays a bit more attention to the different parts. Also it's a wondering site-reading/coordination tool. Of course playing these games is not like playing the real instrument. There's no groove/feeling, but even so playing Drums on expert in Rock Band 1/2 is still cool, especially for friends of mine that have never played drums before
Anyway just wanted to point out how cool it was someone mentioned Amplitude since it was made by the same people.
On a side note if you like synthpop music (I know it's a weird taste) you should check out Freezepop. They have music in all of Harmonix's current games since one of the three members is an audio engineer for Harmonix. Both band members commonly play key-tars and one often brings out an old Yamah QY70 (I think it's called) and uses that on stage. If they were drummers I would have pointed them to zendrum a while ago