In musical comedy Rose-Marie (see also there) as Jim Kenyon and Rose-Marie LaFlamme respectively. At first published separately as The Call. Rudolf Friml was a Czech composer who'd been one of Anton Dvorak's students while in Prague.
Leo Reisman Orch. [oldest recording (Columbia)]
Olive Kline [first sung version]
Edith Day & Derek Oldham [in West End cast]
Jeanette McDonald & Nelson Eddy [in first film version]
Ann Blyth & Fernando Lamas [in second film version]
Carl Denver [hit UK]