Eupfhoria - Marathon Soundtrack Remake
Eupfhoria is a fully re-instrumented and re-scored soundtrack mod for the first Marathon. This replacement tries to remaster the original soundtrack while retaining the original feel. It IS the tracks you know and love, as it's based off the original MIDI files. Most tracks should fuller and more atmospheric, hopefully a bit like Marathon's younger brother, Halo.
To see if this is for you without downloading, you can stream it all here: Eupfhoria - Full Album Stream
Installation is simple, just replace your Music folder found in the Marathon directory. Backup your original folder if you want to go back to the originals.
NOTE: Don't use this for your first playthrough. Really. This is for people who've played through it before and want a new experience. Updating those pesky textures is one thing, but save this for your second playthrough.