Hi Chris,
Thanks for replying! Halo (and Marathon before that) were massive influences for me, I got a bit obsessed with it and wrote a load of fan music back in the day:
https://soundcloud.com/nicholassingercomposer/sets/halo-demos
https://ocremix.org/artist/4764/nick-singer/remixes
Would love to help out, can you drop me a line at mail@nicholassinger.com?