Soundproofing
http://gunnerxlop561.over-blog.com/2019/08/soundproof-construction-it-s-not-as-challenging-as-it-seems.html
You have a rock band, and also no place to practice. Well, you can practice in your cellar, garage, or bedroom yet you stay in a condo, or a removed residence with neighbors crowding you on both sides. What sound