The Steve Sax Trio

From the animated TV series The Simpsons (02/20/1992).

In the "Homer at the Bat" episode (02/20/92), Mr. Burns (voiced by Harry Shearer) needs a batch of baseball ringers for his company team to win a million-dollar bet, and sends his assistant Smithers (also voiced by Harry Shearer) to bribe up a batch. Smithers finds Steve Sax (voiced by himself) in an unlikely place, playing stand-up bass with this piano-drums-bass jazz trio in a jazz club.

The episode also featured a bunch of other pro baseballers playing themselves: Wade Boggs, Jose Canseco, Roger Clemens, Ken Griffey Jr., Don Mattingly, Mike Scioscia, Ozzie Smith and Darryl Strawberry.