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"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" has been recorded many times, notably by Frank Sinatra, Ella Fitzgerald, and U2.

Sinatra recorded the song five times; with Axel Stordahl in his first solo session in 1942 and again with him in 1947; with Nelson Riddle in 1956 for A Swingin' Affair!, with Don Costa in 1961 for Sinatra and Strings (considered by many to be the best version), and even a disco version with Joe Beck in 1977.

Fitzgerald's most celebrated recording of the song occurred on her 1956 album Ella Fitzgerald Sings the Cole Porter Songbook. The song was recorded in 1982 as a one-off collaboration between Tracey Thorn with student friend Ben Watt as Everything But The Girl; subsequently the duo became a well established pop act.

The song was recorded by U2 in 1990 and appeared on the Red Hot + Blue compilation album. Thomas Anders (of Modern Talking fame) recorded his version in 1997 on the album Live Concert. Rod Stewart recorded a version for his 2004 album Stardust: the Great American Songbook 3. A rendition was recorded by The Temptations and the version is features in and on the soundtrack for the 2000 movie What Women Want.

In 2004, a version of "Night and Day" was included in the biographical film about Cole Porter, De-Lovely, sung by John Barrowman and Kevin Kline. The song was also recorded in 2005 by Sondre Lerche on his album Duper Sessions. In 2007 it was recorded by Bebel Gilberto with a bossa nova approach on her album Memento.

The construction of "Night And Day" is unusual for a hit song of the 1930s. Most popular tunes then featured 32-bar choruses, divided into four 8-bar sections, usually with an AABA musical structure, the B section representing the bridge.

Porter's song, on the other hand, has a chorus of 48 bars, divided into three section of 16 bars, with the third section including the bridge.

This song is well known for having unusual chord changes (the underlying harmony.)

The tune begins with a pedal (repeated) dominant with a major seventh chord built on the flattened sixth of the key, which then resolves to the dominant seventh in the next bar. If performed in the key of Bb, the first chord is therefore Gb major seventh, with an F (the major seventh above the harmonic root) in the melody, before resolving to F7 and eventually Bb maj7.

This section repeats and is followed by a descending harmonic sequence starting with a -7b5 (half diminshed or Ø) built on the augmented fourth of the key, and descending by semitones - with changes in the chord quality - to the supertonic minor seventh which forms the beginning of a more standard II-V-I progression. In Bb, this sequence begins with an EØ, followed by an EbØ, D-7 and Db dim, before resolving onto C-7 (the supertonic minor seventh) and cadencing onto Bb.

The bridge is also unusual, with an immediate, fleeting and often (depending on the version) unprepared key change up a minor third, before an equally transient and unexpected return to the key centre. In Bb, the bridge begins with a Db major seventh, then moves back to Bb with a Bb major seventh chord. This repeats, and is followed by a recapitulation of the second section outlined above.

The vocal verse is also unusual in that most of the melody consists entirely of a single note - the same dominant pedal that begins the body of the song - with rather inconclusive and unusual harmonies underneath.

Some have seen the use of repeated notes in the verse as an indication of the singer's obsession.

• Night and Day, in MP3 format, performed by The Black Coffee Jazz Quintet
• Night and Day performed on British TV by British singer Alma Cogan.