In 1976, David Bowie famously told us that "Rock has always been the devil's music." I enjoy hearing about the real or rumored occult influences on rock and roll, and famous musicians' interests in the "dark arts." Gary Lachman's "Turn Off Your Mind" and Erik Davis's book on Led Zeppelin IV are fun reads on the subject. Greg Taylor, who edits the terrific Daily Grail site, wrote his own engaging essay on the roots of "Occult Rock," from Robert Johnson and the Rolling Stones to Led Zeppelin, Bowie, and Tool. The piece, titled "Occult Rock," appeared in the second volume of Greg's journal of weirdness,