Glad I was there.

I’ve expanded. Plus, there was plenty of stuff I didn’t like in the 60’s and 70’s.

to do with dancing with cute young ladies. Just a hunch

so my best guess is something off American Beauty (Ripple/Brokedown Palace or Till the Morning Comes), or Europe ‘72 (ChinaCat, Ramble On Rose).

Checked out the Billboard 100 and of those:
Bust A Move: Young MC or Never Tear Us Apart: INXS

…and The Eleven. A bit earlier. I got heavy into the Dead with Workingman’s Dead.

Chicago 25 or 6 to 4.
But if I hear something else I might change my mind.

There was a girl...

Alas, that song cane out when I was out of college in 1980.
In 9th grade, I was just getting into rock, after years of playing jazz piano.
I didn't know many bands, other than The Beatles & other MAJOR acts.
Thinking about it now, it's probably Black Sabbath. The first song off their first album.
When that opening riff comes in and lands on a flatted fifth, I thought "You can do this in rock music?" I was hooked.
If you would have said junior year, I'd have said Superstition by Stevie Wonder.