On a song-request thread elsewhere, the person who requested songs
has made it clear that
"The [Blue] Green Hills of Earth" is a different song than
the requested one.

And yet a number of Mudcatters, judging from the posts,
are acquainted with the lyrics and their origins.
So why not give the song its own thread?

Just my two cents' worth:
I heard a live performance at Boston's Symphony Hall
of the Paul Winter Consort,
performing Winter's own musical setting of
"The Blue Green Hills of Earth."