The best way would be to build another room inside the existing one and try not to let the ceiling and walls touch the originals. Using wire to hang the joists from the existing ceiling will minimize sound transfer. You can use 1 inch metal rails for the joists or even 2x4s. Adding insulation and having two doors between the rooms will help further. Using an exterer door with weather stripping is a must also. Bass will be the hardest to stop but the mids and highs can easily be reduced or eliminated.
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