Jakob Gumpel,  Gaslight, 1943.  The Russian-born pianist-composer was looking around town for acting work. He was first seen for George Cukor’s take on the Patrick Hamiltion play.  Hardly a stretch.  The role was listed as: Pianist.  But Coates gave in and played exactly that role in Song of Russia and was Himself in Two Girls and a Sailor. End of screen career.