In Elvis Presley's '68 Comeback Special, there came a point where he had to address the fact that, after almost a decade of making bad movies, he'd been eclipsed by the Beatles and all that had come after them. By 1968 he was largely seen as an anachronism. He was all too aware of the shallowness of his movies -- he once said "the only thing worse than watching a bad movie is being in one".
But after bringing up the Beatles, he...changed the subject! He launched into a little lesson on the roots of Rock n' Roll, pointing out that it grew out of Gospel and Rhythm & Blues. It was an eye-opening revelation to me as I watched at home. Within days I bought a B.B. King record, which lead to a life-long interest in roots music. Here's that section of the Comeback Special, which was, to me -- as much as I enjoyed hearing him sing his old hits -- the heart and soul of the show.