Known In The '70s For: Leaving the '60s trio the Supremes and being a successful solo singer in the '70s

Before Beyonce, there was Diana Ross. Formerly of uber-successful girl group The Supremes, Ross struck out on her own in 1970, and topped the chart with "Ain't No Mountain High Enough" from her eponymous debut album. She also launched a movie career, playing Billie Holiday in Lady Sings the Blues (1972), which she won a Golden Globe for. Her 1975 film Mahogany was also a success, and "Theme From Mahogany (Do You Know Where You're Going To?)" was another number-one hit.