Music Levels

I am constantly on Clint and Jasmine for having their iPods turned up too loud. I worry about their hearing. But then I think about all of those concerts I went to with huge speaker mountians sitting on the edge of the stage. My eyes rang for a couple of days after a concert. I wonder how much damage I did to my eyes with loud music. I suppose the difference between then and now are the style of headphones. Today the headphones fit directly into your ear instead of sitting on the outside of your