Halo 2 and 3 soundtracks, no need to make new soundtracks at all!
The soundtrack for 5 was pretty similar to the classics.
Soundtrack for Halo 5 is fine. The original ones wouldn’t fit the game and probably not fit Halo 6 either.
No need to bring back old music. I want to hear something new!
Fun Fact: The majority of the tracks in the Halo 2 and Halo 3 OSTs are just remixes of tracks from the CE OST. Halo Reach, ODST, and 4 are the only OSTs that do not follow this trend, while Halo 5 remixed only the most recognizable themes.