Playing music with friends

Kids nowadays get together talk about games apps, gadget or anything that have in common but not into music or books. Since I have a friend who have a small music room at home and he always invite us to play music with his kids at home, I think we should go his house during our free time and let them play in the room. The music room was a simple one, which he gets inspired to diy here on how to setup sound proof room, some used music instruments, speakers and etc. I doesn't know that he actually has a cool set of Guitar equipment.