Quote from The_Zapster
I like this idea, as a new player would wonder what the roar was and try to find where it came from, and also just a nice little mystery element.
Also, I think after the final roar of the Enderdragon, (after exiting through the portal back into the Overworld,) the wither's gong sound should follow it.
that is a great idea maybe we can then start a topic about a wither roar hahahah
but jokings aside the wither roar is a very nice idea and makes you think "it isn't over?"