Get out! He sang Already Gone and Lyin Eyes? I never knew that. Was this in the 80s? I know some songs that haven't been performed by the band since the 70s are Tryin, Certain Kind of Fool, Too Many Hands, Earlybird, Twenty-One, Get Up Kate and Journey of the Sorcerer.
Disclaimer: I am not saying Don should or will be or could be considering performing these songs. I'm just trying to answer Shun's question. Though it would be fun to see Don and his band break into JOS.
Edit: oops, I forgot about Nightingale, that's another one.