Jack Sheldon (born November 30, 1931) is an American bebop and West Coast jazz trumpeter, singer, and actor. He is a trumpet player and was the music director on The Merv Griffin Show, as well as the voice heard on several episodes of the educational music television series Schoolhouse Rock!  Sheldon was born in Jacksonville, Florida, United States. He originally became known through his participation in the West Coast jazz movement of the 1950s, performing and recording with such figures as Art Pepper, Gerry Mulligan, and Curtis Counce. Sheldon played the trumpet, sang, and performed on The Merv Griffin Show. He was Griffin’s sidekick for many years. Prior to joining Griffin’s show, he served as bandleader for the short-lived The Las Vegas Show.

https://www.youtube.com/watch?v=m4ZKqwvuRLs