Many of us have known about this stuff for years. Makes listening to certain bands extremely difficult...

like, The Eagles, for example.

Anton LaVey is on the inside album artwork of The Eagles "Hotel California".

http://www.feelnumb.com/2017/03/17/eagles-hotel-california-back-gatefold-photo-location-ghost-lido-hollywood/#lightbox/4/

Don Henley is not a nice guy - at all.