Throughout her lengthy career as a multimedia artist, singer, songwriter, and peace activist, Yoko Ono remained a visionary. Before her romantic and creative partnership with John Lennon, she was an established figure in the world of avant-garde art and music. A classically trained vocalist and pianist, Ono worked with John Cage and LaMonte Young in the early '60s and had connections to the Fluxus art movement. When she and Lennon began making music together in the late '60s, she challenged him to become a more experimental and autobiographical artist. Meanwhile, her music ble...