is it common for your ears to ring for more than three days after a concert

My web hosting service (Squarespace) tracks queries that lead to this website, and I like to read them to see how people find the site (knowing people are reading this stuff keeps me going!)  Here's one of the sadder ones I've seen, "is it common for your ears to ring for more than three days after a concert?" Whoever searched this found my "concert goers bill of rights", which I wish we didn't need. 

And, of course, while the answer is it may be common for your ears to ring after a concert, it certainly should not be.  This poor concert goer may now have tinnitus, thanks to some moronic band and irresponsible promoters.