Costrin, how creepy of you to post this little article, as I was just thinking about it an hour ago or so. Music can very successfully change my emotional state. It's not some kind of an uncontrollable force, that changes my mood even though I'm trying to resist. Rather, I open myself to the music and allow it to form my mood and let it take me into its world, as I said above.
I even tried it out by changing to some mellow folk music after a while of really depressing funeral doom. Worked well.
But again, it's not an uncontrollable thing, it's like it says in the article, I usually choose music so it would help me direct my mood into a desired direction, or take me deeper into the current one.
It doesn't really make sense jumping directly from a sad slow-paced ambient song into an upbeat jolly folk tune, though. Except when it does sometimes. I don't know..
Don't usually think of it that much. Just listen to what I feel like listening.
EDIT: Would be weird if you actually wrote that thing yourself, and I am referring to it as "this article". Haha.