"Night and Day" is a popular song by Cole Porter. It was written for the 1932 musical play Gay Divorce, and is perhaps Porter's most popular contribution to the Great American Songbook.

Fred Astaire introduced "Night and Day" on stage, and his recording of the song was a #1 hit. He performed it again in the 1934 film version of the show, renamed The Gay Divorcee, and it became one of his signature pieces. The song itself became an American standard and has been recorded by dozens of artists.

Porter was known to claim that the Islamic call to worship he heard on a trip to Morocco inspired the song .

The song was so associated with Porter that when Hollywood first filmed his life story in 1946, the movie was entitled Night and Day.

Night and Day (AKA La Nuit et le Jour or The Night and the Day) is a "fantastic ballet" in 1 act/3 scenes, with choreography by Marius Petipa and music by Léon Minkus.

The ballet was premièred on May 18/30 (Julian/Gregorian calendar dates), 1883, at the Moscow Imperial Bolshoi Theatre by the Imperial Ballet. Principal Dancers - Eugeniia Sokolova (as Queen of the Night), Ekaetina Vazem (as Queen of the Day), Mariia Gorshenkova (as the Night Star), and Vavara Nikitina (as a Dove).

• NOTE - This ballet was produced for the festivities held at the Moscow Imperial Bolshoi Theatre in honor of the coronation of Tsar Alexander III and Empress Mariia Feodorovna, who were crowned at the Upensky Cathedral of the Moscow Kremlin three days prior to the ballet's premiere. The Tsar was so impressed by the work (being an avid balletomane) that he ordered the work be performed a second time two days later for a performance attended only by his immediate family. A March from the work was among the Tsar's favorite pieces, and he often requested that his orchestra play it during Imperial Balls and other social events for the St. Petersburg royalty and nobility.

Night & Day is the first single from The 747s debut album Zampano.