There was a thing, a video, that i saw linked somewhere, it was pretty bad looking.
the "group" doing it was named something silly like "BrOkeNCide" or similar assault on language.
I was like o.0 it was really, really bad.
Also, I read a thing, about how it's because the Ear ages. Older people, (and not all that old these days), cannot hear the highest notes, and as such do not get the same experience as younger people. When listening to the music they grew up with, the older people's brains fill in the gaps, so it sounds fine, even though they can't fully hear it.
therefore "what's that rubbish you're listening to?" is a perpetual complaint, based upon the aging of the Ear.
Furthermore, the usage of personal devices, Walkmans, Discmans, iPods, mp3players etc, with thingies going right into the ear, the hearing of people deteriorates at an appallingly high rate. Navies have problems recruiting sonar operators, as school-leavers hearing isn't as good as it used to be, for example.
This will make the age at which people say "modern music is rubbish" younger and younger, due to the premature aging of the Ear.