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As kazoo pointed out you've got to figure out a way to disconnect from the other side. Sound is being carried through the floor; ceiling and studs in the wall. You could try dampening it with rugs, insulation etc. but I'd bet you won't be satisfied with the results because you still have the floor and ceiling to deal with.
You could try building a second wall in front of the party wall. Make sure the studs don't touch. And use boiler insulation on the back of it. It's nasty stuff but for dampening sound it's cheap and effective.
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