The Original Soundtrack to the film South Pacific was released by RCA Victor in 1958.
The composers had much say in this recording, with many of the songs performed by accomplished singers rather than the actors in the film.
[1] Mitzi Gaynor and Ray Walston (who had played Luther Billis in the original national tour and in the original London production) were the only two leading performers who did their own singing in the film (and on the soundtrack album).
The roles of Emile DeBecque, Bloody Mary and Joe Cable were sung by Giorgio Tozzi, Muriel Smith (who had played the role in the original London production) and Bill Lee, respectively.
[1] In the UK, the album remained in the top five for 27 consecutive weeks before reaching No.1 in November 1958.