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If you really want to go crazy, you add horizontal bracings between the studs (three levels of bracings, say at 3 foot, 6 foot, and 9 foot), then cover both layers of studs with plywood and nail it in every 6 inches or so. Then add the double dry wall with greenglue in between.
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If you're going crazy, the drywall/plywood combo should be 5/8"
drywall --3/4"
plywood -- 5/8"
drywall with the screws and green glue.
It is important to remember that just because a material is good at preventing sound from leaving or coming into the room (transmission through walls), that does not mean it will make the room sound any better with regard to frequency effects INSIDE the room. Those two characteristics are INDEPENDENT of each other.