The Evolving Lyric. When you listen to a popular song, it might be in background. Or in the car or through your head-phones. You might just be enjoying the feeling it gives you. Or you might actually be listening to the words. The words in a Beatles song are always magnificent; always a story; sometimes a simple Boy meets Girl (Love, Love Me Do) sometimes a whole city-scape (Penny Lane), sometimes a philosophy (Across the Universe). But even within the story, there are variants of the story. Those lyrics evolve. Let it Be is just not the same song as when you first heard it; It's evolved as only a fine wine or a classic novel or loving relationship might do. Jumping Jack Flash by that great band-of course-the Rolling Stones is an awesome, awesome track. But it is reliably static: fixed in evocation. How do the Beatles do that evolving lyric stuff? As their former rivals would say: God Only Knows. But thankfully they did and they do.
That's another reason we love the Beatles.