I'm tempted to say it was silent. Sound (as we typically define here on Earth) requires a more-or-less stationary medium to travel through. Because all the matter of the universe would have been moving simultaneously after the Big Bang, there was no stationary medium in which sound waves could have existed.
Those are my gut feelings about it, but I'd be interested in what Discovery Channel had to say about it.
Those are my gut feelings about it, but I'd be interested in what Discovery Channel had to say about it.