In my school, there were the Nirvana kids, and they were like, the epitomy of cool. They weren't the most popular kids, but they were intimidating even to the popular kids.
They used to wear Nirvana shirts most days, and on the days they didn't, they would be wearing ACDC or Black Sabbath shirts. So those bands were considered cool.
For a really long time, rap artists and hiphop artists were only popular with the wog groups (sorry if that offends anyone, but they called themselves that way before we did, and I'm a wog anyway, I'm just not in the wog group) and the stoners. But lately, all these artists became popular with the popular kids, replacing Britany Spears and all those sort of people.
And then there's the Green Day/Simple Plan people, which are the popular kids who say they are real hard core rockers, when they wouldn't know the first thing about rock music apart from that they look cool when they wear the t-shirts. I really can't stand most of these people, because they don't care at all about the music or the artists, and just wear the tour shirts and stuff so that they look cool. If they did genuinely like the music, then that would be okay, because I do understand that people don't always have my taste in everything, but it just makes me so mad that they dress that way just because all their friends are dressing that way.
Because U2 don't fit into any of these categories, they're kind of the "other" music that no one cares to look into. They were crazy for Vertigo at the start of this year, but I don't think many people actually knew who sung it.