I think you miss something here. music is not just the number or combination of notes. spacing between the notes is also as important as the notes themselves. a different scale can give a totally different feel to a composition, also the velocity ? (the push ? not sure what it's called in english ...) of the notes. both of them which make the total combination of composable music nearly infinite ... also as karlos said, modern music is somewhat limited in scales and possible combinations (I mean the western scale). that's why it sounds like it's repeating itself I guess ...
