Very interesting thoughts!!

Any instrument could be considered synthasized (sp)... it's something people create.
Shamans and Mystics and many other people from our ancient past, used music, chants and instruments to incite certain emotions from the spiritual to battle lust.
And studying binaural sounds shows that certain frequencies affect the brain in different ways...
Can a person become addicted to music? Maybe not in and of itself, but to the feelings it evokes I think it most certainly can.

I love music and a lot of times, if a particularly "moving" melody comes on the radio I will stop what I'm doing to enjoy it. I'll even sit in a parking lot until a song is finished if I like it enough. But I generally don't have a problem shutting off immediately afterwards (before something else catches my attention lol).