I wish concerts weren't so loud. There's so much going on in the treble in metal music, and even "hi-fi" earplugs like Etys filter out more treble than bass, so you end up with a dull, mushy sound. Or, if you don't wear earplugs for a few minutes, you almost immediately get temporary hearing loss in the treble, so all you can hear are the double kick-drum patterns anyway, even during guitar solos.
I should go into the lucrative business of being a sound guy.