I don't post much, but I had to show you guys this;
fig.1
It's called Frets on Fire and its an open source guitar playing game,
much like what I assume guitar hero is.
But this game is designed to be played using a keyboard like a guitar, see fig. 1.
I really liked this, but I've never played Guitar Hero. So if you have and this pales in comparison, sorry
Website + Download incase you missed it, http://louhi.kempele.fi/~skyostil/uv/fretsonfire/
If this has been posted before, SEARCH CAME UP WITH NOTHING