Well, here's a whole siteful of The Lord of the Rings lyrics: The Tolkien Music List

http://www.telia.lv/~witchcraft/jrrt/jrrt2.htm

But the one I wanted to mention is...

THE BATTLE OF EVERMORE
(ŠLed Zeppelin 1971)

Oh the war is common cry, Pick up you swords and fly.
The sky is filled with good and bad that mortals never know.
Oh, well, the night is long the beads of time pass slow,
Tired eyes on the sunrise, waiting for the eastern glow.
The pain of war cannot exceed the woe of aftermath,
The drums will shake the castle wall, the Ringwraiths ride in black,
Ride on.

Sing as you raise your bow, shoot straighter than before.
No comfort has the fire at night that lights the face so cold.


(There's also another Zeppelin tune with the lyric "in the deepest depths of Mordor where the Evil One dwells" which has been ridiculously attributed to Satanic worship when it is obviously a literary allusion to LOTR!...I'll post it when I find it, I should know it, but. )

[Edit:]

RAMBLE ON
(ŠLed Zeppelin 1969)

Mine's a tale that can't be told, my freedom I hold dear.
How years ago in days of old, when magic filled the air.
T'was in the darkest depths of Mordor, I met a girl so fair.
But Gollum, and the evil one crept up and slipped away with her, her, her....yeah.

Ramble on...

(well, I was close...and my apologies to my man Gollum for forgetting him here! I dunno how the Tolkien song site missed this one?)