There is a very active music scene that the under-30 crowd participates in (I'm 20 myself), but I've never been to a concert that was attended by more than 100 people. The one exception to that was when I went to the Coachella music festival, and every band I saw there was stunned by the size of the audience (that place gets 50,000+ spread out over 5 stages or so). But there is a big reason why those tours made more money than tours by newer bands: ticket price. U2 can afford to charge $300 for a ticket because their fans can pay that sort of concert. I certainly couldn't. Ticket prices for concerts I attend rarely go over $10. I turn on the radio and don't even recognize anything except for the Green Day (you can't seem to escape American Idiot ANYWHERE). Only about 1-in-10 of the CDs I buy are published by members of the RIAA, so nothing I buy even shows up in their statistics. I attribute a great deal of the fall in CD sales to disinterest in the music major labels are publishing.