Soundproofing
https://elliottvxzj603.wordpress.com/2019/08/05/soundproofing-foam-is-it-the-solution-to-your-noise-problems/
You have a rock band, and also no area to practice. Well, you might practice in your basement, garage, or room yet you live in an apartment, or a detached home with next-door neighbors crowding you on both sides.