Pop music usually has an engaging rhythm, repetitive lyrics, and an approachable musical style that is easy to sing-along. The ability to sing along is key for a lot of people who like to listen to lively music in the car while commuting and are basically killing time. Some pop music is easy to dance to as well, so you can dance and sing and be entertained in a very light-hearted fashion.
Music and rhythm is ingrained into human experience. It may even be genetic. Pop music is primarily written in 4/4 time and the simplicity of that allows people to drum along easily at whatever speed best suits their dexterity without losing their place. So there’s that, too.
Pop music is also usually written in very familiar musical keys, so people can predict where a song will go or harmonize, even if they’re hearing it for the first time. Even if it’s written in a more unusual key, many if not most people appear to have an innate understanding, enough that they can sing along or merely enjoy the symmetry and simple beauty of the music.
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