Many potential songs I could have gone with but I’ll pick Michael Jackson - Beat It because I remember playing musical chairs to it at my sixth birthday party! I can still picture my mum getting ready to press the stop button on that big silver ghetto blaster. This makes it one of my earliest childhood memories to involve “grown-up” pop culture, as opposed to toys and Saturday morning cartoons.
Finally, an easy one
Big Girls Don’t Cry
https://www.youtube.com/watch?v=y8yvnqHmFds
Had a big effect on me as a little girl, because I’d never let them see me cry - I was a BIG GIRL!
I Want To Hold Your Hand by The Beatles. One of my earliest memories.
Older sister used play it so much I’m convinced it was my first earworm.
mmm
Easy: Lean on Me, Bill Withers - Bill Withers - Lean On Me [with lyrics] - YouTube
As a little suburban Wonder Years white boy walking to school, I scrunched up my eyes and sang the heck outta that song. I feel for my neighbors, but it was part of the start of a lifelong love affair with the music.
My parents always watched Mitch Miller, so this was a favorite. Be Kind to your Web-footed Friends.
Not merely a song, but an entire album. In 1956, when I was 10, my father bought the Original Cast recording of “My Fair Lady.” It was his first stereo recording, and he played it to death. I knew every word of every song on that album. And I still do.
My mother loved “Unchained Melody” by the Righteous Brothers. Mom had a lovely voice and would sing it even when it wasn’t playing on the radio.
“Every Little Thing She Does Is Magic” by The Police
I LOVED singing the "Bee-ohhhh!"s in this when I was four-six years old, and even called it ‘The Bee-Oh Song’. 
Something from the, “Old People’s” radio station. I never did learn what station that was, or if/when they changed their programming. My grandmother always had it playing on a radio sitting on her kitchen/dining room table. After she died, my dad did the same thing.
Bert Kaempfert & His Orchestra - Swingin’ Safari
But it could just have easily been one of fifty others.
Spanish Flea - Herb Alpert & Tijuana Brass
One more to go!
I had the Goofy Greats compilation when I was a child. I listened to it until my parents hid it, and I’m pretty sure it made me the man I am today.
So, from that, here comes The Hollywood Argyles - Alley Oop.
The biggest song of my childhood that I adored more than life itself was:
I still love it beyond belief.
For my 5th birthday I got the Let it Be single. First prezzie I remember. My only other memory of that is poo-pooing the A side and bouncing off the walls over the b-side: You Know My Name (Look Up My Number).
Georgy Girl, by the Seekers. My mom had the 45 and loved the song. We’d always dance and sing to it.
I’m from the band’s area, so I’m familiar with that one. Part of my childhood as well. Interestingly, it took the lead singer about 5 minutes to write it between sets one night, or so he claims.
Here they are performing it on The Midnight Special. Great live performance.
I don’t know that story, but it has that “fun guitar riff to jam on” feel to it, like Joe Walsh with Life in the Fastlane. He was using the riff to warm up because it’s a fun riff to play, and Henley and Frey said “what’cha got there, Joe?”
Fun to play in a band. Easy to see why it is such a durable song.
I never knew the name of it, but when I was 8 years old I thought this song from The Pink Panther was the coolest thing, ever.
Yeah, they’re both great riffs. Joe’s a real savant. Horrible (recovering) alcoholic, and he doesn’t come off as a terribly bright, but he has tremendous musical talent.
Here’s “Funky Music’s” story, according to Wikipedia: