In the Lord of the Rings trilogy we often hear the Nazgûl theme music:
What are the lyrics and translation for the words the choir sings repeatedly throughout the films?
Dungeons and Dragons Online gives this translation for the Black Rider:
Nebabitham Maganane Netabdam daurad Nepam ned abarat-aglar ido Nidir nenakham Bari 'n Katharad
'We deny our maker. We cling to the darkness. We grasp for ourselves power and glory. Now we come, the Nine, Lords of Eternal Life.
From Lyrics Translate:
Ristais dúath Nerchennin o chuil Coll am na waewath goeyl Tellin i Neder Gurth renia Meditha han phan Meditha ardhon
Shreds of shadow Torn from life Borne aloft By fell winds. The Nine have come Death has taken wing. He will eat it all Eat all the world.
Also, here's a video with subtitles
and another one
To answer the question, we need the lyrics of the poem written for the movie by Philippa Boyens (and translated to Adûnaic by David Salo); The Revelation of the Ringwraiths:
Nêpâm nêd abârat-aglar
îdô Nidir nênâkham
We renounce our Maker
We cleave to the darkness
We take unto ourselves the power and glory
Behold! We are the Nine
The Lords of Unending Life.
This poem is not used directly on the soundtrack but fractions of it appear at many places. You can find them here.