Here's an experiment for ya.
Sit down with one of your favorite records and listen. I mean really listen. Let go of focus and listen to every note of every instrument through the whole thing.
Do you find it hard?
The next time you go to a concert, listen for how the sound engineer does or does not prioritize different sounds in the band at different times.
A good sound engineer will direct you, he/she will bring out the most important aspects of a song.
You know a bad sound engineer when everything is always the same volume and you have a hard time distinguishing what matters.
I suppose this is true for most forms of communication.