Much of the source music in G1 was especially recorded for the film in the style of artists from the 1940s, as Paramount did not want to payout on royalties to singers and publishers. So, it is impossible to find the exact versions of "Manhattan Serenade", "All Of My Life", "Santa Claus Is Coming To Town", and "Have Yourself A Merry Little Christmas", as they are unavailable commercially.

The music used for the "Going to the mattresses" montage is "This Loneliness" which appears on "The Godfather's Wedding Album" LP.