The studio we rehearse at is well set up, staggered entry/exit times, masks to be worn by everyone loading in/out, staff all wear masks, only online booking/payment so no banknotes changing hands. Sanitiser in every room, the only part of their equipment any of us would touch is their bass cab when connecting up my amp, same with keyboard player plugging into the PA. It’s probably as safe as most workplaces that are COVID-secure. The only real element of risk is it’s another place being frequented, with yet more people, whereas if staying at home there’s less risk involved, providing family members have followed rules/guidance in their workplaces or shops they visit.