Having just played a track from Popol Vuh’s Das Hohelied Salomos on WXPN’s Highs in the 70s: Progressive Rock show, I was thrilled to discover a new Popol Vuh video up on YouTube. It’s a track of the “classic” PV line-up with singer Djong Yun, guitarist Daniel Filschesher, oboe player, Robert Eliscu and PV founder…