Oldy-Grandma
Teenagers? I think it's more the side of the media, promoting commercial bands and generating lower and lower quality bands, so they can actually control and contract what the bands make and have gone down the lines of emo music etc. I mean the likes of Greenday, Blink 182, Good Charlotte and Linkin Park have gone down an emo-ish route as these emo band crawl out of the woodworks to keep in line with the commercialism - because depression sells, anti-war sells. Marilyn Manson lost his two main song writers, John 5 and Twiggy so his music has lost signs of talent and has followed the sex/depression route.
That's in terms of commercial alternative music, Pop music will make me rant more.
Of course, your Bob Marley reference, shows that we don't have talent like that anymore, I think he was one of the only decent reggae artists, hip hop, rap, rock, punk and metal have all gone the way of commercialism, which is slightly ironic, because most of them were about free-expression and sticking it to formal style and sticking it to conformity. It's a shame, as some of the talented doesn't get the reconition they should.
Support the return of Cow-Fishing! Hook up Paris Hilton and die!