Watch free video The Playhouse (1921)

The opening scene, a dream sequence prior to the vaudeville routines which follow, is what makes this film famous.
In it Keaton plays everyone in a theatre simultaneously (through multiple exposures).
He is the band leader, all its members, the dancers on the stage and everyone in the audience.

Director: Edward F. Cline, Buster Keaton
Producer: Joseph M. Schenck
Production Company: First National Attracktion
Audio/Visual: silent, black & white