The late 1970s became the era of the Bee Gees, thanks to their soundtrack for the film Saturday Night Fever, which included the ballad How Deep is Your Love.
The band was to go back into the studio to start working on their next album when Producer Robert Stigwood asked them for songs for his new film.
Brothers Maurice, Robin and Barry Gibb offered five songs for the film soundtrack, including How Deep is Your Love, which was written by the trio.
Recorded in France and the US, the song was released as a single in September 1977, two months before the release of the film and a month before the soundtrack release for Saturday Night Fever.
The single topped the UK charts and soon the US Billboard Hot 100 and Adult Contemporary charts, the first of six consecutive number one hits from the soundtrack, and two additional which are by the Bee Gees, Night Fever and Stayin’ Alive.
And the song also hit more records , as the only song (at the time) to ever accumulate 33 weeks in one run on the Billboard Hot 100 and stayed in the top 10 for 17 consecutive weeks.
The soundtrack to Saturday Night Fever is one of the best-selling soundtracks of all time, certified 15 times platinum, staying on the Billboard album charts for 120 weeks until 1980 and won the Grammy Award for Album of the Year, the only disco album to ever win the top prize.
As one of the classic ballads by the Bee Gees, in an interview with Billboard Magazine in 2001, Barry Gibb admitted it was his favourite song.
The song has been used in other films and television series including Sex and the City, Donnie Brasco, The Simpsons and Parenthood.