Okay, what the heck does "POP" mean?

I'm confused. I never knew that "pop" was short for 'popular'. I always thought "pop" meant stuff like Madonna, Britney Spears, Justin Timberlake etc...like more danceish stuff. So now that I know it's short for 'popular' I'm confused. Wouldn't that mean that... show more I'm confused. I never knew that "pop" was short for 'popular'. I always thought "pop" meant stuff like Madonna, Britney Spears, Justin Timberlake etc...like more danceish stuff. So now that I know it's short for 'popular' I'm confused. Wouldn't that mean that Soulja Boy would be "pop" too since he's popular? And when you guys say a band isn't rock, it's pop. what is that supposed to mean? Their genre is rock but since it's popular they aren't rock anymore? I just don't get what pop is anymore.
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