I've had this exact problem attending most concerts (only classical music seems mostly fine). The music sounds very distorted (like a damaged speaker or an audio recording with heavy clipping) and after a while it gets physically painful to listen. Movies are sometimes uncomfortable, but the volume level is less constant which helps a lot. I've asked around and nobody seems to share this experience. I didn't use to go to live events often and it actually took me years to realize that my hearing's at fault.