That's what makes it sound "musical", not "good". A lot in music breaks down to establishing patterns and breaking them. Simpler music, like pop music relies h

That's what makes it sound "musical", not "good". A lot in music breaks down to establishing patterns and breaking them. Simpler music, like pop music relies heavily on well known patterns, but at least the chorus usually has some element of surprise within the song. My theory is, that people like music that is just a little (or for the more adventurous a little more) surprising. With training in listening to music, as a musician or just as an ambitious listener, your taste will begin to widen to more complex music. This is because you begin to recognize its patterns (and only when a pattern establishes, you can break it to create suspense or surprise). Simpler stuff will become very shallow, because it's so predictable (just remember the shameful musical taste when coming of age). Of course there is more to a pop song than harmony and melody, so even when your taste becomes more sophisticated you might like a pop song for its emotional appeal or some subtile complexity or depth the novice won't even notice.