I came across this Article on HowStuffWorks.com. It had a lot of interesting noise problems and solutions. Check it out!
Turner, Bambi.
"Can you block neighbor noise in a townhome or condo?."
18 May 2009.
HowStuffWorks.com.
http://home.howstuffworks.com/home-improvement/repair/block-neighbor-noise.htm
04 December 2009.