beatles are the best pop band ever.
for what it's worth, this list explicitly states what is deems a pop song: a song that's performed well on an american popular song chart. i'd say that's as good a definition of 'pop song' as you'll find. no need to generalize, shoe-horn, or look down upon a genre of music that just so happens to have a similar name to a definition.
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ICON:
I'm pretty serious about chocobos.