"Blackbird"- The Beatles
"Don't Think Twice It's Alright"- Bob Dylan
"The Loner"- Neil Young (acoustic version of this song is BRILLIANT)
"The Lee Shore"- David Crosby
"I've Got A Name"- Jim Croce
"Malted Milk"- Robert Johnson (covered by Clapton on Unplugged)
"What Would You Say?"- DMB
those are a few of my favorites-- most Dylan works (try not to pick any that are too cliche'd lol) and Neil Young is great
good luck with your gig!