"I Could Have Danced All Night" – Performed by Audrey Hepburn (dubbed by Marni Nixon), Mona Washbourne and Chorus, from the musical film "My fair Lady” (1964). The song is sung by the musical's heroine, Eliza Doolittle (Audrey), expressing her exhilaration and excitement after an impromptu dance with her tutor Henry Higgins (Rex Harrison) in the small hours of the morning.