It took me a minute to realise, but I think today's Writer's Block prompt must have been inspired by the fact that Dec 8th marks the thirtieth anniversary of John Lennon's murder. Which, although I wasn't a fan at the time, shocked me deeply when I heard about it, as I couldn't understand why anybody would want to kill a pop star. Bear in mind that in 1980, I was only 18 years old and used to viewing the world through rose-tinted glasses. I didn't as yet have any direct knowledge of the evil that men do.
I was also too young to subscribe to the idea that The Beatles were the greatest band that ever existed. Their heyday coincided with my childhood, and I wasn't that interested in music then. It wasn't until 1973-4 that I began to take a much more active interest, and by that time, The Beatles had disbanded and become a thing of the past. Sometimes, I'd hear one of their songs on the radio, and I might think they were charming; but I was really only waiting to hear the latest Queen or David Bowie release. Besides, Mum always told us that The Stones were much better.
It wasn't until much, much later that I actually started to listen to their music and decided that it was really rather good. I came to admire the way the songs were crafted, their melodies and arrangements, and the lyrical content of their later work. Some of them even became fast favourites, such as Eleanor Rigby or Here Comes the Sun. But I think my absolute favourite is Blackbird, if for no other reason than that I like its outdoors-y quality, with the birdsong in the background.
And before you ask: I still wouldn't describe myself as a Beatles, much less a John Lennon fan. But I can't deny the profound and lasting influence they had on so much of the music that came after.
ETA: My favourite Lennon song, incidentally, is Dear Prudence (credited to Lennon/McCartney), esp. in the cover version by Siouxsie & The Banshees.