Though many tie the song "White Christmas" to the movie, the song was first performed by Bing Crosby 13 years earlier, on the radio show The Kraft Music Hall . | 15 Things You Didn't Know About "White Christmas"
The soundtrack rights for the film were controlled by Decca, but Rosemary Clooney was under exclusive contract to Columbia, a competing record label. So in 1954, Decca recorded and released an album with the movie cast minus Clooney (her part was sung by Peggy Lee.) And Columbia released an album with Clooney singing 8 songs from the film. Which means the only way to hear her sing with Bing is onscreen! - TownandCountryMag.com