I’ve thought about this before. Here’s my go:
In regards to sound: If you take a tuning fork and smack it, it will vibrate. Vibration can be pleasurable. If the tuning fork is a brain, and the smack is music, then the result is a contented or slightly altered-from-the-norm feeling, that might be akin to the vibration of a tuning fork if tuning forks like vibrating.
In regards to lyrics: Singing along to things or singing by oneself can bring joy to one. This could have to do with the feeling of one’s voice reverberating through their body, psychological factors I won’t pretend to know, a combination of factors, or of course something I haven’t considered.
Let me know if that helps, doesn’t help, or causes confusion.
Now that I think on it, maybe it is for some people. If you consider the lyric “lose yourself to the music, the moment...” the instruction to ‘lose oneself’ implies the experience must be voluntary; much like hypnosis, if you don’t wish to succumb to the hypnotic flow of the hypnotist’s drone, you won’t.
Then again, music also passively affects brain waves. I can’t find a review article after searching for five minutes. The neuronal firing patterns—the frequency of firing, or brain waves—induced by heavy metal differ from jazz, which yet differs from classical, which further depends upon the composer and the piece.
Compare: this solo to this solo, and these ー pieces ー here。