Paul Specht (1895-1954) and his orchestra in a recording studio. Musicians include Chauncey Morehouse (drums; holding cymbal), Frank Guarente (trumpet; next to Morehouse) and Arthur "The Baron" Schutt (piano; holding saxophone(!) in the middle of the back row). Specht himself is to the extreme right.
Unnamed photographer in employ of Bain News Service.
Probably first half of the 1920s.
Bain News Service photograph via Library of Congress website <a rel="nofollow" class="external autonumber" href="http://hdl.loc.gov/loc.pnp/ggbain.35296">[1]</a>