As to the "classic" rock, I think it is hard to predict what music will be popular in the future. My son is 31 now and I rarely played music when he was growing up so he was pretty much free to listen to whatever he wanted, and mostly liked the stuff that was popular at the time for his age group. But at some point he (and his friends) discovered Led Zep and the James Gang and Aerosmith and AC/DC and the Doors and many other high-quality bands that we now call "classic." To me, the quality and complexity of that music is what makes it so good and still viable today. The lightweight stuff is forgettable but Led Zeppelin will rule forever! LOL!