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Here's a little bit of info I know. Sound can be transmitted (ie: from your neighbors to you) in two ways: airborne sound, and structure borne sound. Airborne transmission happens when sound waves hit a surface (neighbor's floor), the surface flexes, and the sound is reproduced on the other side (your room). This can be solved by adding MORE MASS to the ceiling in the form of another layer of drywall, and by putting insulation between the wall surfaces. Rock wool is great for acoustic treatment inside a room, but in a wall the regular fluffy pink stuff works just as well and probably costs less. Sound goes anywhere air goes, so any time you build something for sound, it must be airtight construction. Caulk everything with non-hardening caulk/acoustic sealant.
Structure borne transmission is sound carried through the solid structure of the building. For an example of this, put your ear on an end of a 2x4 and have someone LIGHTLY tap the other end. You will see that you can hear it very well, even louder than you can hear it in the room through the air. This is also known as flanking. The way to deal with this is through decoupling the structure somehow (resilient channel, "shock absorbing hangers" (I forget the real name), room-within-a-room design (recording studios use this)). I don't have my reference book infront of me but this is all I can remember off the top of my head. Keep researching
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