This article would seem to indicate that it is in fact illegal. http://www.slate.com/blogs/browbeat/2013/01/18/jonathan_coulton_glee_and_baby_got_back_did_fox_

This article would seem to indicate that it is in fact illegal. http://www.slate.com/blogs/browbeat/2013/01/18/jonathan_coulton_glee_and_baby_got_back_did_fox_steal_the_arrangement.html http://www.slate.com/blogs/browbeat/2013/01/18/jonathan_coul...