Sir Richard bishop, formerly of sun city girls, is the most occult musician I know of, mainly because I spent a solid thirty minutes discussing magic and ritual with him. Got to see him open for swans years ago and this was at the height of of my fascination with magic so I grabbed the opportunity.
He essentially said his songs are rituals and he often uses them to communicate with various entities. He said the ritual magic he used was most similar to order of the golden dawn. Overall very cool man.
I also told mistook Michael Gira for a homeless man and refused to give him a cigarette. I wasn’t at my best.