No need for the bloody hystrionics, Sian. It's not all that well known. Let me find the words and post them; I suspect they are similar enough to the hymn to be a clue. I'd post the tune, too, but I'm having trouble transcribing it, and would like to see the original.
The first verse goes:

Lay down your weary tune, lay down
Lay down the songs you've sung
And rest yourself 'neath a [....] of wings(?)
No man can hope to strum(?)

Guess I really better go look.
Blessings,
Barbara