Sometimes artists on the more extreme end of things (writers, painters, musicians, etc.) will inadvertently channel some serious forbidden knowledge without even quite knowing they're doing it. In writing, H.P. Lovecraft is one of my favorite examples of this. In music, among a few others, I believe Edge of Sanity's "Crimson" is a definitively strong example of this effect, both thematically and lyrically: https://youtu.be/pV6VGT4ak2s