I'll start off with Raiden II's Repeated Tragedy.
A local restaurant had this game, and every time we went, I'd beg my parents for money so that I could play it. I wasn't very good at the game, so I never got past the first stage, and so I heard this song a lot. Really gives me nostalgia.
Also got to shout out Streets, from Timesplitters too. I put a lot of time into this game as a kid, and this song is what got me into futurepop (love me some VNV Nation).
that entire soundtrack, i was a child so it took unreasonably long to complete the game & they're <2 minute loops on each planet/zone. shit is etched in my brain
The Manaan Ahto City ambient music and the track from the Kashyyyk upper canopy especially