Those are what identified Halo music, those 3 brought a sense of wonder, exploration, epic, drama, and a battle to survive into the universe that is Halo. The score was amazing and captivated the sense of astonishment precisely as we encountered Covenant or Flood or stumbled upon ancient ruins on Installation 05.
Halo Combat Evolved was astonishing and revolutionary because of how exotic it was to the modern fps, WWII or Desert Storm era shooters. Halo became a blockbuster hit because of its uniqueness. Sadly Halo has more competition on consoles, COD, BF, etc. but instead of competing against them by remaining unique and exotic it is beginning to assimilate with modern day shooters to compete ever since Reach.
Reach was a fantastic game but it also marked Halo downgrading into “realism” by the art design (fantastic as it was it was showing too much realism to feel like a true Halo) and gameplay with the addition of loadouts and the DMR which IMHO does not differ at all from a Modern FPS weapon from design and use.
I am not trying to say new Halos shouldn’t change and add and remain the same always, not at all, what I am driving at is Halo should remain it’s unique self with exotic weapons, enemies, vehicles, locations, remember how BA the chopper was? Remember first arriving on Installation 04? Remember the dreaded atmosphere of the campaign level 343 Guilty Spark?
The Halo franchise no longer has anything exotic to differ from today’s fps’. What I truly hope for in Halo 5, is to introduce new environments, new enemies, new vehicles and weapons of which can only be done in Halo. Weapons such as the Needler or vehicles such as the Brute Chopper or Scarab.
Reason why I titled this the main “instruments” behind the original Halo Trilogy OST is because it solely depicts what Halo stood for, how Halo was a franchise that was clearly away from the crowd and stood amongst the best such as Half-Life or Doom for it was revolutionary in many ways, but it remained amazing for it’s rich story and just amazingly exotic.
TLDR: Halo needs to be more exotic as it was before.