Are pop songs often composed on "layers" and is there a common set of layers used in pop music?

Question

I was reading this question and this question, both of which discuss the parts that are often present in a piece of music as it progresses from beginning to end.

The question I wanted to ask is about the "layers" that can be present in a musical piece from the beginning to the end. For example many pop songs have a (often, some repeating drum) beat in the background and vocals more on the foreground.

1. Is there a proper term for these layers?
2. Is there a "typical set" of these layers that would commonly be present in pop songs?

Answer 1

What you call "layers," the rest of the music world calls "arrangement." And yes, genres of music are built around distinct commonalities of arrangement.