Well, in my opinion, The solo to freebird is pretty hard. I mean, if you can play it, good, but if you can play it perfectly then that is impressive. No, its not the fastest solo, or has the hardest licks, but it does entail different techniques (fast picking, hammer ons, pull offs, string skipping, etc.). Anywhoo, thats my greatest accomplishment on guitar, is learning that solo. But, maybe its not that impressive after all.