Old man rant incoming
But like WTF why does no one know how to mix concerts anymore? If it's so loud you can't even hear the singer and it blows out people's ears what's the point. Turn the volume down so we can at least hear the musicians and not static.
/rant
It is indeed awful for the most part. I love going to shows and seeing bands live, but it's a complete crapshoot if the sound will be reasonable. Earplugs shouldn't be a requirement.
Trying to think of something recent that really comes to mind, but I'm just thinking of Wintersun just about a year ago. Sound was pretty awful, but if you knew the tracks it was enough to enjoy. They play the newer track "storm" or whatever it's called. i have no fucking clue what is going on, it was a complete mess. Less is more applies to sound mixing too.