For every one of those decades I could name several rock bands who were commercially successful and whose music also represented a major, youth-oriented cultural movement which challenged the status quo. I am hard pressed to name a single band like that which started recording in the 21st century. Interpret it as you will but I think he has a point that the stuff that gets into the top 40, certainly within the rock genre, is not as politically or culturally relevant as it used to be. If that kind of music is still out there, people aren&#x27;t buying it anymore.