Ehhh, it's not to much of an eye opener for me, maybe for someone unfamiliar with music, but my high school music teacher had been telling me that since freshman year.
It didn't click with me till I started to reall listen to music though, all kinds and then I realized how much he was right. Most people don't really listen to the music, they listen to the SONG, or the message. Which is a bit cliche to say but it's really serious business, and these songwriters know the deal with it and exploit the fuck out of it. Which they should.
Besides, it really is pleasing to listen to.