Pop music
In a historical sense, Pop(ular) Music is defined as the opposite of classical music and is popular at the time it was written.
However, there are some alternate meanings, which could be:
Pop music has universal meaning, which makes the lyrics easier to relate to.
Pop music has simple melodies that very memorable to the listener.
Pop music is merely a genre, like rock or hip-hop.
The way the term popular music is most commonly used is actual popular music. This construct of pop can hold rap, R&B, rock, whatever. The funny thing is that people refer to it like there is an actual genre classification that bonds Eminem, the Jonas Brothers, Madonna, the Black Eyed Peas, and Coldplay.
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