How can I temporarily soundproof my apartment ceiling?
I often hold parties with music at my house and would like to do a courtesy to the neighbors by soundproofing my walls. Their house is about 100' away.
Is there a way I could block or dampen the sound going out, preferably a non-permanent solution? I have thought of acoustic foam panels, sound absorption sheets, even a treeline between our houses, but as I have never done this sort of thing before, would like the community's input.