I've been watching this for a couple days, trying to pick 5. I just can't. Every time I think I have 5, I see someone's list and think, "OH, I forgot about that song!".
My favorites change almost daily. It depends on what Beatle era I'm into at the moment. I break it down into: the early stuff, then Help through Revolver, Sgt Pepper through Yellow Sub, White Album through Abbey, then the solo stuff. I'm just coming out of the solo stuff now, and have been thinking about the early music lately.
It always amazes me how much they changed in a few short years. It's still fresh for me after all these years!
Andy,
Your five are definitely near the top of my list! What great tunes!
I'll think some more and try again later.

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