http://www.synthesiagame.com/
Similar to guitar hero, played with Midi files, and a midi keyboard for those here who have one.
Though keep in mind its not 5 buttons, its actually playing the song, although you can change speeds and all that.
And for added flavor I got bored and wrote up a shitty cover of Sleeping Stars into (clean part) for piano
http://www.yousendit.com/transfer.php?action=download&ufid=D2A02914159F8BC1
Similar to guitar hero, played with Midi files, and a midi keyboard for those here who have one.
Though keep in mind its not 5 buttons, its actually playing the song, although you can change speeds and all that.
And for added flavor I got bored and wrote up a shitty cover of Sleeping Stars into (clean part) for piano
http://www.yousendit.com/transfer.php?action=download&ufid=D2A02914159F8BC1