Oh, I looked through that song list guidelines on the first page and (even though I dont quite know about muti-/single-streamed ogg files), it says its able to be replaced by a single- streamed ones. And I actually replaced it one time a while ago in the games files, but, it didnt loop (cuz I didnt know how to make it loop at the time), but if the Mines area (slbgm_machine) music cant be replaced, than no big deal..if I really wanted to listen to it, id have it on loop while playing in the mines with ingame music turned down/off..so, either way..
Edit: I kinda know what you mean, cuz isnt there a slight change of the music from Mines 1, 2, and 3, same as all other Ep 1 stages? Im guessing thats what meant by "multi-streamed"? If not, then, ya got me..lol..
If its too much hassle, then, dont worry about it i guess..