^ Agree with Murph. I doubled the drywall and used acoustical sealant between the first layer and studs, as well as between the two layers... Used Roxul Safe and Sound insulation, solid core door, etc. It works well, but clearly not soundPROOF, which is tough to do with HVAC vents and the like. The added cost of full soundproofing didn't justify the gain for me, seeing as how we're in a detached house and the bedrooms are two floors up.