Hmm. It's been a while since I've been to a drunken campfire sing-a-long but if I remember right, here are a few of the usual suspects:

1) Tangled up in blue
2) Knockin on heavens door
3) Good-bye blue sky
4) Sugar Mountain (that's a really fun song to sing loaded)
5) Across the Universe

In case you didn't notice, apparently I hang out with older people. :)