I like pop music too much to narrow it down to one song!
Band on the Run by Paul McCartney. This is the first rock song I remember liking a great deal. I remember listening to the 8-track of the album it came from in the car on drives to the countryside. I would’ve been 4 or 5. Around that time, I was also introduced to The Beatles.
Rich Girl by Hall & Oates. I was probably about 6, long before I even knew what Daryl Hall looked like (I found out when Kiss on My List came out a few years later and I was utterly smitten). I remember thinking when I first heard it in my guardian’s friend’s car, “Ooh, he said a bad word!” when the lyrics got to “It’s a bitch, girl…”
Head Games by Foreigner. We had a guy like Otto the bus driver on our bus when I was in 2nd grade, but since this was a few years before the Walkman™, he would blast this and other “rawk” songs from the transistor radio he hung near his window. I was the only kid on the bus who liked any of the music he played.
How Deep Is Your Love? by The Bee Gees. Our bus driver that year played pop music. There were a couple of girls on my 4th grade bus who would sing along to this with me, and since we were all church-trained singers, even at 9, we got the harmonies down. So much fun.