Thank God It's Friday is a 1978 American musical-comedy film directed by Robert Klane and produced by Motown Productions and Casablanca FilmWorks for Columbia Pictures. Produced at the height of the disco craze, the film features The Commodores performing "Too Hot ta Trot", and Donna Summer performing "Last Dance", which won the Academy Award for Best Original Song in 1978. The film features an early performance by Jeff Goldblum and the first major screen appearance by Debra Winger. The film also features Terri Nunn, who later achieved fame in the 1980s new wave group Berlin. This was one of several Columbia Pictures films in which the studio's "Torch Lady" came to life in the opening credits, showing off her moves for a few seconds before the start of the film.

Thank God It's Friday tells several intertwining stories of the patrons and staff of the fictional Los Angeles disco The Zoo over the course of a single Friday evening. These people include:

• Tony Di Marco – owner of The Zoo. Lecherous and promiscuous, he's inordinately fond of his 1974 Porsche 911 Carrera.
• Bobby Speed – the club's DJ, who's broadcasting his first live show from the club.
• Frannie and Jeannie – two high school friends who want to win The Zoo's dance contest to buy KISS concert tickets.
• Carl and Ken – a hopelessly near-sighted schlub looking for a casual liaison, and his friend looking for a girlfriend.
• Dave and Sue – a young married couple celebrating their fifth wedding anniversary.
• Jackie – dental hygienist by day, drugged-out disco freak and Zoo regular by night.
• Jennifer and Maddy – the new girl in town taken to the disco by her know-it-all friend who's not as sophisticated as she thinks she is.
• Nicole Sims – an aspiring disco singer.
• Marv Gomez – a self-described "leatherman" who lives to dance.
• Malcolm Floyd – the roadie for The Commodores, responsible for delivering their instruments to the club by midnight.
• Gus and Shirley – a mismatched couple on a blind date.

Sue insists that her uptight accountant husband Dave take her to the disco. On a bet with Bobby, Tony tries to pick up Sue. Dave is drugged and renamed "Babbakazoo" by Jackie, and makes a fool of himself. Carl and Ken are repeatedly thwarted in their attempts to meet girls. Frannie and Jeannie trick Marv into helping them sneak into the disco after several failed attempts at gaining entry. Jennifer tries to meet a guy, but Maddy vetoes each of the guys that Jennifer is attracted to. Nicole repeatedly attempts to slip into the DJ booth to get Bobby to play her single. Crude garbage collector Gus is horrified that the dating service has matched him with a prim college educated woman, and one who is taller than he is. Floyd gets stopped repeatedly by the police on suspicion of stealing The Commodores' instruments. Marv teaches the uptight Ken how to dance.

Maddy ditches Jennifer to attend a hot tub party (with the same sleazy guys who came on to Jennifer). Gus and Shirley decide to give it a try. Carl finally meets a girl, but becomes trapped in a stairway before they can leave together. Floyd makes it to the club in time for the Commodores to play, but before they go on, Nicole sneaks up on stage and scores a huge triumph singing "Last Dance". Frannie, after tricking Marv's dance partner into the locked stairway, enters the dance contest with Marv. Carl and Marv's dance partner hook up in the stairway. Jennifer and Ken share a romantic dance, as do Nicole and Bobby. Dave comes down and Sue ditches Tony. Tony's parked car, having taken innumerable hits from pretty much every other character's car, falls apart in the parking lot. Marv and Frannie win the big dance contest. Deciding that the KISS concert is "kid stuff", Frannie and Jeannie, now self-proclaimed "disco queens", go with Marv to hit another disco for the 1:00 a.m. dance contest.

The film production occurred during the summer and autumn of 1977 at 333 S. La Cienega Boulevard (on the corner of La Cienga and San Vicente Boulevard) in Los Angeles. The building was formerly named the Millionaire’s Club, which was closed several years before the film. Within these several years, the building underwent “a series of disco and restaurant attempts,” including one named Cabaret. It then was reopened as the nightclub Osko’s in December 1977, several months after the filming.^[3] The club had four dance floors and 'the Cave', an ice cavern-themed room as seen in the film. Osko's was also a filming location of the horror film Jennifer. Club owner Osko Karaghossian had a role as a bouncer in the film. Osko's nightclub was completely demolished by the early 1990s and was replaced by a large Loehmann's dress store.

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The film contains many popular disco songs, with many key performers featured, including Donna Summer, Pattie Brooks, Love & Kisses, The Commodores. A triple album containing many of the tracks heard in the film was released six weeks in advance of the theatrical release to build up interest in the film.^[19]

Several songs heard in the film were not included on the soundtrack album, including Alec R. Costandinos' "Romeo and Juliet", Giorgio Moroder's "From Here to Eternity", The Originals' "Down to Love Town", D.C. LaRue's "You Can Always Tell a Lady (By the Company She Keeps)", The Commodores' "Brick House", The 5th Dimension's "You Are The Reason (I Feel Like Dancing)", Meco's "Meco's Theme" and the Village People tracks, "In Hollywood (Everybody Is A Star)" and "I Am What I Am".

The biggest hit single on the album was Donna Summer's "Last Dance", which won an Academy Award as well as a Golden Globe for Best Original Song and also made it to #3 on the US singles chart. The song was written by Paul Jabara, who the following year composed Summer's duet with Barbra Streisand, "No More Tears (Enough Is Enough)". Jabara performed two of the songs on the Thank God It's Friday soundtrack and appeared in the film as well.

The soundtrack album was issued as a three-record set in 1978, of which the third disc was a single side 12 inch single of the 15:45 minutes Donna Summer, "Je t'aime... moi non plus" track. Upon its 1978 release, a promo set of separate 12" singles of every track was released to select DJs only. An edited CD came out in 1995 on the budget label Rebound Records. A digitally remastered version of the full soundtrack on a 2 disc set was released on PolyGram Records on March 25, 1997. The company that holds the rights to the album is as of 1998 the Universal Music Group. The album is described by many as the world's only five-sided soundtrack album.

Cameo's "Find My Way" was issued as a 7" single in 1975. Giorgio Moroder and Donna Summer's cover version of Serge Gainsbourg and Jane Birkin's 1969 hit single "Je t'aime... moi non plus" was recorded a few years earlier, but had its debut on the soundtrack and was issued as an edited 7" single in a few countries in 1978. "Too Hot ta Trot" was from The Commodores' 1977 album Commodores Live! – on certain editions of the Thank God It's Friday album replaced by a studio recording. The song topped Billboard's R & B chart the week of February 18, 1978. Other titles on the soundtrack, including "Last Dance", were recorded for the film.

Diana Ross' "Lovin' Livin' and Givin'" was remixed after the release of the soundtrack and used as the opening track on her 1978 album Ross. It was released as a single in certain territories and has since been remixed and re-edited a number of times for inclusion on various hits packages issued by Motown/Universal Music.

The final part of Donna Summer's "Last Dance" is later re-included as a separate track titled "Reprise" toward the end of the soundtrack album. An edited version of the whole track was the version issued on the 7" single in most countries, and this track can be found on many of Summer's compilations, including 1994's Endless Summer and 2003's The Journey: The Very Best of Donna Summer. The 12" single used the full-length 8:11 version. A live recording of the track was included on the album Live and More, issued in late 1978 and the following year the studio version was remixed by Giorgio Moroder for what was to be Summer's final Casablanca Records album On The Radio: Greatest Hits Volumes 1 & 2. The 1979 mix can be found on Summer's 1993 and 2005 compilations The Donna Summer Anthology and Gold respectively.

An extended remix of Summer's "With Your Love" was issued as a promo 12" single in 1978; a slightly shorter version of this can be found on the cd Mercury Records/PolyGram's 1987 release The Dance Collection: A Compilation of Twelve Inch Singles. The 8 track cartridge and cassette both feature the full length version.

Other films released during the late 1970s disco and jukebox movie musical craze

• Car Wash (1976)
• Saturday Night Fever (1977)
• Sgt. Pepper's Lonely Hearts Club Band (1978)
• Skatetown, U.S.A. (1979)
• Roller Boogie (1979)
• The Apple (1980)
• Xanadu (1980)
• Can't Stop the Music (1980)
• Fame (1980)