The band's co-founder passed away on Monday (23Nov15), according to Billboard.com.

"Friends, Famliy and Fans through out the world, Cynthia Robinson, Trumpeter and Co- Founder of Sly and The Family Stone has passed," a message on Robinson's Facebook.com page reads. "Our condolences go out to the Robinson Family and her bandmates and all family & friends! You are in our thoughts and prayers and we are here for you.

"Please continue to support the Cynthia Robinson Cancer Care Fund due to the rising medical costs (anything helps). This site will stay up in her memory. God bless you Cynthia!"

In October (15), Robinson announced she had been diagnosed with cancer and established the Cynthia Robinson Cancer Care Fund to help cover the cost of her medical care.

Robinson is best known as one of the first African-American, female trumpet players in a major U.S. band after joining Sly Stone's backing group in 1966. She was the only member to continue working with Stone following the band's breakup in 1975. The musician also played with George Clinton and Prince.

She is survived by her daughters Laura Marie and Sylvette Phunne, whose father is Sly Stone.