The Two Towers, “The King of the Golden Hall”. Gandalf sang this in response to Gríma saying that webs of deceit are woven by the Sorceress of the Golden Wood.

In Dwimordene, in Lórien
Seldom have walked the feet of Men,
Few mortal eyes have seen the light
That lies there ever, long and bright.
Galadriel! Galadriel!

Clear is the water of your well;
White is the star in your white hand;
Unmarred unstained is leaf and land
In Dwimordene, in Lórien
More fair than thoughts of Mortal Men.

Provided by: NenyaGold