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- Exalted Member
Human Music and Sound Design Initiative did, in fact, make the "Deliver Hope" trailer for Halo: Reach.
This was the same production company that created the live action Halo 3: ODST trailer and original soundtrack. Unfortunately, though it was also requested many times over with that trailer, no musical release (excluding the sound effects and voices of the characters in the trailer) was ever released.
Thus, although the audio in this trailer is very beautiful, it is doubtful that we'll ever get to see a clean audio track from it.