I take drum lessons every friday. The practice space is a tiny room with 2 drum kits with mutes. I've never played the drums without hearing protection. So tonight, I find out that I have a substitute instructor for a few weeks. When I got in the room, I saw there were no mutes. He began to play me a samba pattern on the snare. With every hit, my head pounded. After about 5 minutes, I had a terrible headache. And when he hit the crash!...Either the instructors hearing was shot, or he just got used to it. Another reminder to always wear hearing protection!