OK. Here are the words that Graves wrote. I don't know if it's the set that your singer sang though. I'm just off to bed now, but I'll see about putting the tune up tomorrow it it's not already here (I haven't checked for Mentra Gwen threads yet).

Mick

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VENTURE GWEN
(English words to Metra, Gwen by AP Graves)

O'er Cymru, like a star,
  Brightest Gwen, whitest Gwen!
Thy fame has flashed afar,
  Brightest Gwen!
The cresset on yon gateway
Was set to light they late way;
Fear not to enter straightway!
  Only, venture, venture, Gwen!

Far better here to bide,
  Fairest Gwen, dearest Gwen!
Than tempt the mountain side,
  Dearest Gwen!
Their torches wave us thither,
Then, arm in arm together,
From out the angry weather,
  Let us venture, venture, Gwen!

What means this marshalled line?
  Whitest Gwen, brightest Gwen!
These men-at-arms are mine,
  Brightest Gwen!
Thou Queen of Crogen Castle,
Yet I, its Lord, thy vassal!
Now welcome to the wassail,
  Welcome, welcome, welcome, Gwen!