You are bidding on a vinyl copy of Switched-On Bach by Walter Carlos (now Wendy Carlos), issued on Columbia Records (MQ 31018).  The original album was released in 1968, but the quadraphonic edition (in SP quadraphonic format) was released in 1972.    The album itself is in excellent condition.  The sleeve is in VG+ or better with some slight wear at the corners.  The insert has quite a bit of detail about quadraphonic sound.  Incidentally, Columbia discontinued all SQ albums by 1978.  However, these quad recordings are playable on modern turntables.The album will be sent in an LP mailer.