Soundproof Drywall
The home crowd turned us onto QuietRock, which promises to cut sound to the equivalent of 8 layers of drywall. Obviously you won't have a wall that thick and if QuietRock can deliver on this statement then that's got to be one soundproof room.
The applications are endless and they offer 8 varieties of QuietRock to suit every need.
Check here and here for more techniques and information on soundproofing a room.
