This is Larry, before being Larry. He was Dan Whitney on stage, as well as real life. You can see he was new at comedy, and very nervous on stage. Nowdays he's a pro, not nervous at all.
Here, he does "The Beaches of Cheyenne". It must have been a great concert. It was free, and Garth says about 900,000 people showed up. Probably one of the biggest concerts ever!