"Mystery" by Jeremey Gaffen and Paul Winter and sung by Susan Osborn, from the 1982 release of Missa Gaia (recorded 1981 at Cathedral of St John the Divine)
https://www.youtube.com/watch?v=vukjNtbNBbs
I am finding myself very much attracted to the Lindisfarne - St John the Divine group, probably the closest to an 'inner circle' that the New Age movement ever had, and this is maybe the closest thing that exists to their anthem.
Madeleine "A Wrinkle in Time" L'Engle was also in the StJtD circle, I believe.