Swinging the Alphabet

Moe Howard, Larry Fine, Curly Howard & cast in Violent Is The Word For Curly (1938).

The Skeleton Dance

Disney studio musicians in The Skeleton Dance (1929).

Trick or Treat

The Mellomen in Trick or Treat (1952).

(The link says 1954; it's lying.)

Minnie the Moocher

Cab Calloway and his orchestra in Minnie the Moocher, a Betty Boop Talkartoon (1932).

A Cowboy Needs A Horse

Paul Mason Howard and Billy Mills in the Disney short A Cowboy Needs A Horse (1956).