Moon spent the 1950s as a folk music impresario at the Gate of Horn, a Chicago folk music club where guests included the Weavers, Odetta, Joan Baez, Judy Collins, etc. Moon went to Greenwood, Mississippi in 1963 for a folk festival organized by Pete Seeger, Bob Dylan, Theodore Bikel and others. At this event he heard some of the music of the civil rights movement and while recording it he realized that it wasn't only the music that was important. So he began attending and recording mass meetings, voter registrations, and other movement events in the South to record them. He used a 90 lb. tape recorder and a variety of microphones to record not only the speakers and performers, but the audiences as well.
One hundred forty-four audiotapes documenting the Civil Rights Movement.
Moses Moon Collection, 1963-1964, Archives Center, National Museum of American History