I can’t help but laugh when people make these delineations within pop music.
It’s ALL POP.
If it ain’t classical or jazz, it’s just a particular shade of pop.
It was Perry Como, Rosemary Clooney, etc.
Then Elvis, Chuck Berry, Little Richard, Jerry Lee Lewis, etc.
That pretty much did it.
Everything we’ve enjoyed in pop the last 60+ years has been an offshoot of that “Rock and Roll Big Bang.”
It’s ALL POP.
Popular. Hence the abbreviation.