I think you mean John Williams, because John Williams is represented as Kyle Katarn remember...its one of his many facts. Of course...thinking on that now, if they don't have John Williams do the Star Wars music for 7 then it won't really be Star Wars.
John's kinda aging so he wouldn't be able to do all of the stuff Kyle does. Maybe Chuck can be the stunt double.
But, yeah, without John William's music Star Wars won't be the same. I would love to see what he can do with this new trilogy. That's gonna be the main reason I see the new movies.