Funny I had to put one of those up for a dance studio and a movie
theater that shared the same wall. I was the dance studio.
I found that the problem was not the wall but the open area above the
drop down ceilings. Fixed that with drywall and all was fine.
Here is a place with a lot of good information on soundproofing.
In general you want to block air exchange. Air caries sound very well.
(Try opening your car's window as a train is going by.)
Next you want weight. Heavy things (drywall lead sheets etc.) block
You also want to prevent any direct solid connections. Stagger wall
studs or use special isolation devices to keep the sound from traveling
through the wall (remember the two cans on a string (well wire actuarially
worked) you want to break the wire).
Filling in wall cavities with sound absorbing materials (accustical
fiberglass bats) will do a little.
Point source control (special absorption material) at the source of the
sound will also help.
Sound can travel in many ways. Each side having separate wall framing
(with insulation between) helps. Sound can easily travel through
cracks, ductwork, wooden beams, pipes, etc. Soundproofing my house
(to eliminate neighbor dogs barking during the day when I worked
nights) proved to be not very cost effective (it was easier to switch
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