This is a clip from the the musical, Hollywood Hotel (1937), with the Benny Goodman Orchestra playing "Sing, Sing, Sing": Benny Goodman on clarinet, Gene Krupa on drums & Harry Jame on trumpet. The film is not so memorable, save, perhaps, for this musical clip.
The film's summary, for the record, is as follows:
Ronny Bowers, a saxophonist in Benny Goodman's band has won a talent contest an got a ten week contract with a film studio. On his first evening he is supposed to go with the studio's star Mona Marshall to a movie premiere. But this lady doesn't want to go, so the bosses decide to use for Mona a double, Virginia. When Mona finds out next morning that happened, she insisted to fire her double and Ronny.
Ronny finds work as singing waiter in a drive in, and is spotted by a director of the same studio, who wants him to lend his voice for an leading actor in a musical. After the first screening the actor is invited by Louella Parsons to sing in her program "Hollywood Hotel." He accepts, but he doesn't know that Ronny Bowers does not want to lend him his voice again. So everybody starts to play his little game to solve his own problems.
—Written by Stephan Eichenberg <firstname.lastname@example.org>