Labi Siffre wrote Something Inside So Strong in 1984.
Widely believed to have been inspired by seeing film footage from South Africa, of young blacks being shot at by white policeman, the singer-songwriter now reveals that the lyrics were also informed by the oppression he had experienced as a gay man.
The song has been taken up by individuals and groups around the world who have suffered from discrimination. The Choir With No Name in Birmingham, made up of homeless singers, always close their concerts with the song. Choir members explain why it's so important to them, giving them a sense of pride and dignity.
American singer Suede, talks about the power she finds in the song while South African singer, Lira talks about making a special recording of it for the birthday of Nelson Mandela, as it was one of his favourite pieces.
Also hear how Celtic football fans sing it as an act of solidarity with their beleaguered manager, Neil Lennon.
In his first interview for over a decade, Siffre explains how he still sings the songs as he tries to put his life back together after the death of his partner, Peter.
Contributors:
Labi Siffre Bill West Peter Churchill Neil Lennon
Series about pieces of music with a powerful emotional impact
Producer: Lucy Lunt
First broadcast on BBC Radio 4 in April 2014.