The song is sung by the musical's heroine, Eliza Doolittle, expressing her exhilaration and excitement after an impromptu dance with her tutor, Henry Higgins, in the small hours of the morning.

[1] In the 1964 film adaptation of the musical, the song was sung by Marni Nixon, dubbing the singing voice of Audrey Hepburn, who played Eliza Doolittle.

Hit versions of the song were recorded by Sylvia Syms, Dinah Shore, Angélica María, Ben E. King as an ATCO single, Frank Sinatra, Rosemary Clooney, and Jamie Cullum.

Many actresses have also sung the song in the stage version of the musical including Martine McCutcheon, Laura Michelle Kelly, Amy Nuttall, Lisa O'Hare, and Lauren Ambrose.

[5] The song was performed by Jane Powell in the 1959 NBC television special Sunday Showcase "Give My Regards to Broadway",[6] for which a kinescope recording still exists.