: I'll admit, I cheated and ripped the youtube videos of the tracks, but that's
: because Marathon 1 CD is abandonware now and I my Mac doesn't have an OS
: that can run it. (Not to mention I prefer the Aleph One version, thanks to
: quality of life improvements and it works on both Windows and OSX)
The audio tracks are just plain old Red Book CD Audio, like a music CD, so the OS shouldn't matter. You should be able to just rip the tracks in iTunes (to an uncompressed format like WAV or AIFF, preferably, and then convert those to Ogg using your favorite audio conversion program).
There might be a slight problem if the audio partition gets masked by the MacOS partition such that the OS can't see it, but this wasn't the case back in the day, and if it is, it could probably be worked around via some partition finagling.
I'd do it myself, but sadly my M1 CD was left behind long, long ago. It might still be lying around somewhere in my mom's house, assuming it hasn't been thrown away during the last 20 years, shrug.