Martin Luther King, Jr.'s soaring oration has come to define how many think of him, so it's interesting to hear Dr. King speaking conversationally in 1964 with Robert Penn Warren, almost in the relaxed feel of a podcast.
University of Kentucky's Louie B Nunn Center for Oral History summarizes the interview:
Dr. Martin Luther King, Jr. discusses the similarities and differences of his and his father's work as civil rights activists. Dr. King describes and defends his belief in nonviolent methods and provides his reaction to criticisms of his philosophy of nonviolence. He also describes what he considers the next phases of the civil rights movement.
Robert Penn Warren conducted 43 interviews in 1964 with prominent civil rights leaders, all now digitized and archived online.