This is the oldest known complete live show by Al. It was performed at Cal Poly on August 7, 1980. The show features Al and accordion and lead vocals, Joe Earley on jawharp, kazoo, and backing vocals, and Joel Miller on bongos.
Time Stamps:
0:14 - I Wanna Beat a Bull
1:04 - Mr. Frump in the Iron Lung
2:54 - Gotta Boogie
6:00 - It's Still Billy Joel to Me
9:07 - Cal Poly Medley
16:55 - Orgy On My Own
21:16 - You Light Up My Life
22:37 - Intermission
23:30 - Punch a Ball
24:23 - Won't Eat Prunes Again
28:38 - My Bologna
EDIT: Joel Miller has since commented on here and confirmed that this was their last live performance at Cal Poly.