title music

The music for this 1945-made film is credited on-screen exclusively to Daniele Amfitheatrof. But the title music is totally unlike the rest of the score. (It's remarkably unusual for its time. I think it's superb.) In fact, its tune is identical to that of another piece of music by another composer, Dimitri Tiomkin. It's the tune of Tiomkin's 1952 "High Noon" ballad 'Do Not Forsake Me, O My Darlin'. I'm not the only one who has identified it as such while watching the DVD of "The Virginian". (John Leipold is listed here, at IMDb, as the film's uncredited composer of stock music - a capacity in which he seems to have served on dozens of films, many of them Westerns. I like his original score for the 1942 Western "The Desperadoes", for which he did receive a credit.) I'm aware of all the possible explanations, but does anyone know the true one?