Let Your Hair Down

"How Deep Is Your Love" is a ballad written and recorded by the Bee Gees in 1977 and released as a single in September of that year by RSO Records. It was later used as part of the film Saturday Night Fever's soundtrack. It was a number-three hit in the United Kingdom and Australia. In the United States, it topped the Billboard Hot 100 on 25 December 1977 and stayed in the Top 10 for 17 weeks. It spent six weeks atop the US adult contemporary chart. It is 27th on Billboard's All Time Top 100.