I'm a big Allman Brothers fan. "Ramblin' Man," "Midnight Rider," "Melissa" and "Blue Sky" are my favorites. An obscure tune of theirs called "Louisiana Lou and Three Card Monty John" is also a sentimental favorite of mine.
I think "Freebird" by Lynyrd Skynyrd is a good -- but overplayed -- song. "Tuesday's Gone" is their best tune, in my opinion.