For Guitar Hero I, I used Celtic Underground. For II, I used Trunk Munkies, which was followed by LibertyHat!, but I never made that into a file. My friend and I came up with it while I was playing as Izzy with the top hat and he was playing as Eddie with his liberty spikes; thus, LibertyHat! was formed, and will be our Rock Band name. We even have a motto: "Rockin' yo pants off one leg at a time!"
One other one I've thought of but never used is Cromwell and the Roundheads.