I recently ran across the Guitar Hero clone for the PC called Frets on Fire. The game exists in both Linux and Windows versions, and it is open source.
Also, it is possible to make your own songs for it. The game has an in-game fret editor, which allows you to import Ogg sound files and manually trace the song by placing chords/notes on the game fretboard.
It's quite easy to use, if you have the needed sound files... And, HEY! I do!
So, i made a Frets on Fire version of my song Armygeddon. I am sure you remember me babbling about that before, and now you can actually play it yourself.
Therefore, i urge you to download Frets on Fire right away, and download the Frets of Fire version of the Muldjord song Armygeddon and play your ass off... Or your hands, or whatever.
The game:
louhi.kempele.fi/~skyostil/uv/…The song:
muldjord.linuxaddict.dk/music/…