UNATCO theme is absolutely legendary, and so are many other tracks in the original.
I actually got chills during the surprise post-credits scene in Deus Ex: Human Revolution when the og Deus Ex theme started playing.
Same for the DX:HR game that weaves the song in! Before the shine wore off as you play through the whole game.
One of my favorite pieces of music for programming: https://m.youtube.com/watch?v=OSpsAauvEXU