Brian Wilson is known to have had mental problems (and a drug problem). To anyone living in the 21st century rather than the Middle Ages, the explanations lie in brain chemistry and narcotic self-medication, not "demons" unless you use that term highly metaphorically. Meanwhile, the Manson connection to Dennis, aside from being interesting trivia, doesn't have anything to do with anything.
It is not unreasonable, by the way, to postulate that his mental problems may have influenced his music to some extent, at least the material from perhaps Pet Sounds on. Note that in some cases (Pet Sounds certainly) the result was deeply beautiful, hardly "Satanic" or "demonic". One might indeed say, for example, that much of that material was the result of Brian Wilson "working through his demons".
But I sure hope you'd be speaking metaphorically when you say that :-)
i agree with you in many cases. also, some of our most beautiful art comes out of intense pain, and...emotional trauma and instability. i write songs (see my profile page) from such pain, myself.
btw, one of my fave track on PET SOUNDS is LET'S GO AWAY FOR A WHILE. BEAUTIFUL!
The PET SOUNDS LIVE cd by Brian accomplished the almost impossible (thanks in large part to keyboardist Darian Sahanaja (truly a purist) who wanted to stay true to the originals: The live versions of the title track PET SOUNDS and LET'S GO AWAY FOR A WHILE sound as good as, if not better than, the originals.
they sound close to the originals while paradoxically they sound so fresh and new to our culture--beyond the originals.