You have not specified if you mean in the book or in the films ?
In the book (The Fellowship of the Ring), the Elves sing
Elven Hymn to Elbereth
Quote:
Snow-white! Snow-white! O Lady clear!
O Queen beyond the Westren Seas!
O Light to us that wander here
Amid the world of woven trees!
Gilthoniel! O Elbereth!
Clear are thy eyes and bright thy breath!
Snow-white! Snow-white! We sing to the
In a far land beyond the Sea.
O stars that in the Sunless Year
With shining hand by her were sown,
In windy fields now bright and clear
We see your silver blossom blown!
O Elbereth! Gilthoniel!
We still remember, we who dwell
In this far land beneath the trees,
Thy starlight on Western Seas.
In the films, there are 2 answers:
1. Frodo and Sam see the Elves in the Extended Version of the film...god only knows what they were singing.
2. At Lorien, the Elves are singing the Lament for Gandalf, however in the books, this was actually sung by Frodo Baggins and the last verse (as seen in the films) sung by Sam Gamgee...
Quote:
When evening in the Shire was grey
his footsteps on the Hill were heard;
before the dawn he went away
on journey long without a word.
From Wilderland to Western shore,
from northern waste to southern hill,
through dragon-lair and hidden door
and darkling woods he walked at will.
With Dwarf and Hobbit, Elves and Men,
with mortal and immortal folk,
with bird on bough and beast in den,
in their own secret tongues he spoke.
A deadly sword, a healing hand,
a back that bent beneath its load;
a trumpet-voice, a burning brand,
a weary pilgrim on the road.
A lord of wisdom throned he sat,
swift in anger, quick to laugh;
an old man in a battered hat
who leaned upon a thorny staff.
He stood upon the bridge alone
and Fire and Shadow both defied;
his staff was broken on the stone,
in Khazad-dûm his wisdom died.
The finest rockets ever seen:
they burst in stars of blue and green,
or after thunder golden showers
came falling like a rain of flowers.