Two General Electric Project 3 Quadraphonic Demonstration Tapes. PRQ8 4000GE + PRQ8 5000GE . The music is performed by Enoch Light and The Light Brigade (please refer to images for track listing.) Both tapes have been reconditioned adding new pads, foil splices and tested with flawless play as with all the used tapes on the 8tracksRBack website. We will also stand behind them with a 7-Day money back guarantee.