Ysaye Maria Barnwell (born February 28, 1946) is an American singer and composer. Barnwell was a member of the African American a cappella ensemble Sweet Honey in the Rock from 1979 to 2013. In addition to writing many of the group's songs, Barnwell has been commissioned to create music for dance, choral, film, and stage productions. She is also known for being a female bass. Barnwell conducts music workshops around the United States, United Kingdom, Canada and Australia, including a workshop she created called "Building a Vocal Community: Singing in the African American Tradition". In 1977, she founded the Jubilee Singers, a choir at All Souls Church, Unitarian in Washington, DC.