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Like others have said, it depends on the construction type of your condo. I live in a concrete high rise, and you can't hear the sound between units. If the person turns up the stereo and has a lot of base, you can feel the walls shake however.
With wood construction, you can use a sound batt insulation but developers would typically remove the insulation from interior walls as a cost saving measure.
I believe there are fibre boards out there that can be used to deaden sound and absorb it. It's been a long time since I've had to design a sound proof room that I don't know all the materials out there anymore. If the interior walls have a larger air space inside, that would lessen the amount of sound transmitted as well.
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