[youtube id=”oMVe_HcyP9Y”] Joni Sledge of the family singing group Sister Sledge has passed at age 60. Sledge was found dead at her home in Arizona on Friday. Sister Sledge became popular upon the release of their breakthrough album We Are Family in 1979. Nile Rodgers and Bernard Edwards of Chic wrote and produced all of the music on that album which held their two biggest songs “We Are Family” and “He’s The Greatest Dancer.” Sledge and her sisters Debbie, Kathy and Kim formed Sister Sledge in 1971 but did not become famous until the disco era. They released eight albums and performed for the Clinton Administration’s White House, the Glastonbury Music Festival, Oprah’s Women Who Rock episode and a charity show for Pope Francis. The group last performed together in October of last year.