The Cowboy and the Girl (1928)
The scene is a parlor out West, with Ray Mayer sitting at the piano in is cowboy duds - hat, scarf, and chaps. He plays a little barrel-house music and then introduces Edith Evans, who enters wearing fur. She sings - her voice a light-opera soprano - while Mayer plays. musical, cowboy, vaudeville act, vitaphone, short film
ETC.
