Shoot.... Every time you think you know what's going on, something NEW pops up!
Let me start with the old: brainwave entrainment.
Know how when you go to a live concert you kind of get hypnotized by the music? It could also happen with a good stereo, but generally when the stereo is on you are doing something else as well, like driving, or cleaning the house, so it isn't as noticeable. But at a concert you aren't doing anything but being at the concert, and within a few minutes your mind and body fall into the rhythm and beat of the music. Doesn't life seem good when that happens? Don't you feel energized, connected? Doesn't the limit of possibility seem to expand?
That is a example of brainwave entrainment.