Soundproofing
http://waylongshf108.yousher.com/stc-soundproofing-using-rubber-soundproofing-sound-insulation-to-make-wall-surfaces-peaceful
You have a rock band, as well as no place to practice. Well, you could practice in your cellar, garage, or bedroom but you stay in a condominium, or a removed house with next-door neighbors crowding you on both