Short answers, pulled from the story.
The South Pacific soundtrack stayed at number one on the UK Albums Chart for 115 weeks, the first 70 of which were consecutive and included the entire year of 1959. It also spent 214 weeks in the top five.
Giorgio Tozzi dubbed the singing voice of Emile DeBecque on the South Pacific soundtrack, even though a different actor played the role on screen. Rodgers and Hammerstein had significant say in casting vocalists for the recording.
The South Pacific soundtrack was released in mono in March 1958, timed to the film's premiere. A stereo edition followed in August 1958 as part of RCA Victor's first batch of stereo LP releases.
As of 2006, the South Pacific soundtrack had sold 1,803,681 copies in the United Kingdom.
Mitzi Gaynor and Ray Walston were the only two leading performers who sang their own parts in both the film and on the soundtrack album. Walston had previously played Luther Billis in the original national tour and the original London production.
The songs on the South Pacific soundtrack LP and CD are arranged in the order they appear in the original Broadway musical, not the order in which they appear in the film. The European print shown at the Dominion Theatre in London was an exception, presenting songs in the film's own sequence.