I used non backed R12 batts and ran it to the bottom plate. Next is the part to seal the wall. Use 6-10 ga vapor barrier, tape and caulking. To do it right all outlets on the outside walls should be put in plastic enclosures, sealed and the vapor barrier taped to it to prevent drafts thru the outlets. Make sure the vapor barrier is installed so it seals the wall. Tape all joints. I also fill the cavities above the cement with batts and then caulk a 2" solid piece of foam insulation to seal it well.
There is a batt you can buy for just sound insulation. Buddy put them in his place and they do work
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