: No, they're separate from the game. You can play Marathon: Eternal X and they
: will be included when the final version is released. I'm also pretty sure
: you can use them in Aleph One, but I could be wrong about that.
: In short, there are probably ways to get them to play in various incantations
: of Marathon, but not in the original game... to my knowledge. Anyone want
: to weigh in?
I believe that is correct, they definitely can be made to work with Aleph One, but unless you were to supply MIDI versions of them there's no way I know of to make them work with the original M1 - and even then, I'm not sure how exactly, presumably there's some Marathon Music Imploder out there. (And it's just not possible at all with M2 or Infinity. Although, I guess maybe, with proper use of Ambient Sounds...).