Anderson's parents were both devout Christians and the whole family was active in the Union Baptist Church, which, during her youth, stood in a building constructed by the congregation in 1889 at 709 S. 12th Street in South Philadelphia. Marian's aunt Mary, her father's sister, was particularly active in the church's musical life and convinced her niece to join the junior church choir at the age of six. In that role, she got to perform solos and duets, often with her aunt. Aunt Mary took Marian to concerts at local churches, the YMCA, benefit concerts, and other community music events throughout the city. Anderson credited her aunt's influence as the reason she pursued her singing career. Beginning as young as six, her aunt arranged for Marian to sing for local functions where she was often paid 25 or 50 cents for singing a few songs. As she got into her early teens, Marian began to make as much as four or five dollars for singing, a considerable sum for the early 20th century. At the age of 10, Marian joined the People's Chorus of Philadelphia under the direction of a singer Emma Azalia Hackley, where she was often a soloist.