So maybe a lot of you know about this already, but I just found it and I find it to be really cute.
http://www.newgrounds.com/portal/view/561715
It's called Pixel White, and the object of the game is to collect as many white objects as you can in the duration of the song, and the obstacles are the song's wavelength visualizers.
I only tried "The DJ is Mine" by the Wonder Girls atm, but you can choose any MP3 file you have on your computer.
Y'all should try it and post what songs you got, your scores, etc. and we could have a cute ol' time.