Favourite soundtrack song?

[Sauron the White]

I believe that Requiem For a Dream was only used in some of the early trailers before the had the Shore score in place. It also may have been used in the 18 minute Moria promo piece that was shown at Cannes and in some early sample reels for distributors. Requiem is popular as a stand in piece for music not yet written for many other films also.

this from Wikipedia

The soundtrack has been widely praised and has subsequently been used in various forms in trailers for other films and series, including The Da Vinci Code, Sunshine, Lost, I am Legend and the video game Assassin's Creed. More specifically, a version of the recurring theme was re-orchestrated for the The Lord of The Rings: The Two Towers film trailer.[2] This version is often known as "Requiem for a Tower". It has also been featured in many other commercials and trailers, and as remixes on other artists' albums. For example, psytrance giants G.M.S. are widely known for their mix of the song, titled 'Juice by GMS'. Lil' Jon's track, "Throw It Up", sounds very similar to the song for this movie. Many blame him for stealing or copying.