Hi there the sound track that comes with this game that you can play sounds better then the in game sound track (in my opinion of course) where did GOG get and is there any way to put it into the game?

Which game?

Wikipedia:
"A compact disc of the Deus Ex soundtrack was included in the Game of the Year edition and is not available for separate purchase. Notably, the soundtrack is not a direct audio rip from the game itself, however; it is a "remastering" of the soundtrack with added instruments and audio production. Originally only thirty tracks were included with the re-release, with tracks thirty-one through forty-one considered as extras. The PlayStation 2 port featured live, orchestral renditions of some tracks.[citation needed] Also OCRemix made an official remix called Deus ex Sonic Augmentation"

Kidney Thieves: http://kidneythieves.com/music/