Director: Morgan Neville, Out now
Morgan Neville's Academy Award winning documentary tells the story of backing vocalists, or backup singers, and their struggles in the music industry since the 1960s.
They were mainly African American women and most people don't know their names, but they featured in and brought to life many of the most famous pop songs of their day.
The film starts in an era when the music industry was dominated by white people, and this included backup singers. The mould was then broken by black female singers from gospel church choir backgrounds.