<P> Hepburn's singing was judged inadequate, and she was dubbed by Marni Nixon, who sang all songs except "Just You Wait", where Hepburn's voice was left undubbed during the harsh - toned chorus of the song and Nixon sang the melodic bridge section . Some of Hepburn's original vocal performances for the film were released in the 1990s, affording audiences an opportunity to judge whether the dubbing was necessary . Less well known is the dubbing of Jeremy Brett's songs (as Freddy) by Bill Shirley . </P> <P> Harrison declined to pre-record his musical numbers for the film, explaining that he had never talked his way through the songs the same way twice and thus could not convincingly lip - sync to a playback during filming (as musical stars had, according to Jack L. Warner, been doing for years . "We even dubbed Rin - Tin - Tin"). George Groves decided to use a wireless microphone, the first such use during filming of a motion picture . The sound department earned an Academy Award for its efforts . </P> <P> One of the few differences in structure between the stage version and the film is the placement of the intermission . In the stage play, the intermission comes after the embassy ball where Eliza dances with Karpathy . In the film, the intermission comes before the ball, as Eliza, Higgins, and Pickering are seen departing for the embassy . </P> <P> Gene Allen, Cecil Beaton, and George James Hopkins won an Academy Award for Best Production Design for art direction of the film . Beaton's inspiration for the library in Higgins' home, where much of the action takes place, was a room at the Château de Groussay, Montfort - l'Amaury, in France, which had been decorated opulently by its owner Carlos de Beistegui . Hats were created by Parisian milliner Paulette at Beaton's request . </P>

Who sings in the movie my fair lady