So music that crosses over onto the Pop charts doesn't go down in history? You do know that some band named Led Zeppelin also got played on Top 40 stations on AM (and FM) radio back in the day don't you? Your opinion that only "blues based guitar music" goes down in history is one that I disagree with very strongly. Like I said, I'm not particularly a fan of Billy Idol's music or that of A Flock of Seagulls' but if their music wasn't somehow significant, we wouldn't be having this conversation. And U2, whether you like them or not, have already gone down history based on their output from the 1980's alone. There's much more to the world of music than blues based guitar rock. That may be your own personal taste but it's not an indicator of what others consider historically significant.