Nothing Beats playing Free Bird on a little plastic Guitar
Some of my personal favorite songs from GH2 would be "Surrender" by Cheap Trick, "Sweet Child of Mine" by Guns N' Roses, "Carry on My wayward Son" by Kansas, "Crazy on You" by Heart and of course "Free Bird" by Lynyrd Skynyrd. Although there are a decent amount of awesome songs like these, the game seems to have it's share of mediocre songs as well. When playing through the single player mode, there are times when you wish you could just skip some of the songs because they aren't fun to play. Luckily, there are quite a few gems that will make up for the boring parts.
All and all, GH2 is a blast. I would recommend this to anyone who doesn't mind rocking out like an idiot with a plastic guitar.