Isn't it strange that this is as far as I can tell the only modern recording of the Concierto de Aranjuez in surround, even if it's upmixed? There's multiple quad versions available digitally, but nothing from this century:One of my very favorite Membran Multi~CH SACDs
https://www.hraudio.net/showmusic.php?title=10778https://www.hraudio.net/showmusic.php?title=1210https://www.hraudio.net/showmusic.php?title=12040