Office Room Soundproof
https://www.storeboard.com/blogs/general/stc-soundproofing-using-rubber-soundproofing-sound-insulation-to-make-wall-surfaces-silent/967276
You have a rock band, as well as no location to practice. Well, you might practice in your cellar, garage, or bedroom but you stay in a condo, or a detached house with next-door neighbors crowding you on both sides.