"Working Day and Night" is a song by American recording artist Michael Jackson. It is the third track from his fifth studio album, Off the Wall in 1979. The song was written and produced by Jackson. Despite not being released as a single, it has been played often on the radio and in films, becoming one of Jackson's most popular songs. Jackson also performed the song live. It is also featured on the video game, Michael Jackson: The Experience. The song had been sampled by several artists. It was remixed and released on the remix/soundtrack album, Immortal in 2011. In 2014, producer Timbaland, sampled percussion and breaths from the song and sampled them in the duet version of "Love Never Felt So Good" (with Justin Timberlake); the duet was released as a single from Xscape.

"Working Day and Night" was written by Michael Jackson and recorded for his studio album Off the Wall issued in August 1979. The song was not released as a single, but as the B-side for "Rock with You" in the USA, and B-side for "Off the Wall" in the UK. The song has a tempo of 128 beats per minute, making it one of Jackson's fastest songs.

"Working Day and Night" was performed by both of The Jacksons' tours, and two of Michael Jackson's first two world concert series tours as a solo artist.

The song was performed by The Jacksons' Triumph Tour in 1981 and Victory Tour in 1984. In Michael Jackson's solo tours, the song was performed live in the Bad World Tour from 1987-1989, and first two legs of Dangerous World Tour in 1992.

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