Office Room Soundproof
http://lorenzoloka091.unblog.fr/2019/08/05/soundproofing-foam-is-it-the-answer-to-your-sound-problems/
You have a rock band, as well as no area to practice. Well, you could practice in your cellar, garage, or bedroom but you reside in a condo, or a removed home with next-door neighbors crowding you on both sides.