The problem here is - as you suggest - with the charts rather than the Fab Four. But if most people are downloading Lionel Dendingfield (http://strange-powers.livejournal.com/57164.html) this week, and next week it's McFly, and then The Beatles... shouldn't the charts reflect that? I'm certain that the charts have only infrequently been any good at showing us the new, and increasingly showing us what was new a month ago. Why not half a century?