Well this song is really great , doom3 beginning was great too , it's a shame only the beginning was so great , anyway this is the highest quality i could find , if you find a better version please give me a holler , cheers !

Tweaker - DooM3 Theme

From the moment I understood the weakness of my flesh, it disgusted me. I craved the strength and certainty of steel. I aspired to the purity of the Blessed Machine. Your kind cling to your flesh, as though it will not decay and fail you. One day the crude biomass you call a temple will wither, and you will beg my kind to save you. But I am already saved, for the Machine is immortal… Even in death I serve the Omnissiah.

Tweaker - DooM3 Theme

Arygo