Born in 1910, Mary Lou Williams was a child prodigy. She played piano concerts in the homes of her neighbors in the East Liberty neighborhood of Pittsburgh as early as five years old, and was touring by her teens. After a meteoric rise as an arranger for the biggest names in jazz she became a mentor and mother-figure to many of the great jazz musicians of the 20th century. She was a remarkable pianist and composer in her own right — one of the most important of the 20th century. But she also saw the suffering and grief of those around her as drugs and lives of loose morals wreaked havoc on friends and loved ones. Eventually, in her 40s, she had a crisis and walke off the stage in Paris, vowing to never play music again. She instead did everything she could to help everyone she could, but she didn't know how to. She found refuge in a Catholic church in Harlem that she found was not kept locked, so she was able to go in to pray — though she was not Catholic. But her friend Lorraine Gillespie, wife of jazz great Dizzy Gillespie, was considering becoming Catholic. Together they met with the priest and eventually were received into the Church in 1957. After her conversion to Catholicism she returned to the jazz scene, seeing her music as a way to praise God and to evangelize. Her music found new depths of meaning in the prayers, devotions, and themes from Scripture that saved her. She believed that jazz was one of the most pure art forms, and wrote heart-wrenchingly beautiful music over the last few decades of her life, including three different Mass settings. She died in 1981 of cancer and is buried in Calvary Cemetery in Pittsburgh.