Possibly a few songs from the debut, with "Eruption/You Really Got Me" being a God of Guitar, seeing as there is a decent variety of difficulty between those songs.
The Amon Amarth cover likely added at least 3% to the total. I have not heard this in a few years, but I find it more enjoyable than the Great War, or at least find it more diverse (for what my memory is worth).
Piece of Time took a piece of my fretting hand! Looks pretty rough Mister Hyphema, hope it closes pretty soon! I know Mister Patterson was such a classic case of a rock virtuoso dying really young, but I had no idea this would come out of someone attempting a song of his!