...Elton never put out anything in quad, so I'm wondering what they used as a source for his tracks on this. Maybe dual stereo?
http://www.ebay.com/itm/Rare-Elton-John-Carole-King-Quadraphonic-8-track-Q-19-/232167757117?hash=item360e46d53d:g:A1wAAOSw-0xYSNbx
http://www.ebay.com/itm/Rare-Elton-John-Carole-King-Quadraphonic-8-track-Q-19-/232167757117?hash=item360e46d53d:g:A1wAAOSw-0xYSNbx