1955 three versions for the soundtrack of Serenade, the best of which (by far) is sung softly in one of the "Mexican" scenes in the film and has not been released commercially.
(Brodszky-Cahn) – different song
1955 two versions recorded for the film of the same name, but never used. One of these was released on the 2004 BMG UK CD Serenade/A Cavalcade of Show Tunes. The unreleased take is better in some respects (though the ending is superior on the released version).
(from The Student Prince) (Romberg-Donnelly) (partially updated lyrics by P.F. Webster on 1952 MGM Version)
1946 live radio broadcast on Great Moments in Music