We Are Family written by Nile Rodgers and performed by the Sledge Sisters Kathy, Kim, Debbie and Joni was released in 1978 at the height of disco's popularity.
Kim Sledge says it has become the anthem for diverse groups of people around the world who come together on the dance floor to form a family.
Professor Tim Lawrence says disco at its best was an inclusive music movement that welcomed people of all races and genders, unlike rock music which in the early 1970s appealed to a predominantly white male audience.
We Are Family epitomised dance music's appeal to traditionally marginalised groups in the USA - African Americans, Latinos, women and gay men.
Listen to the stories of some of the people for whom the song is linked with some of the most significant experiences of their lives.
Produced by Maggie Ayre.
First broadcast on BBC Radio 4 in December 2019.