 A number of Sun Ra's 1970s concerts are available on CD, but none have received a wide release in comparison to his earlier music.In 1978–80 performances, Sun Ra added a large electronic creation, the Outerspace Visual Communicator, which produced images rather than sounds; this was performed at a keyboard by its inventor, Bill Sebastian.During concerts, the OVC usually was positioned at center stage behind the Arkestra while Sebastian sat on stage with the musicians.