The Fillet of Soul
Rock band that heads to the Bavarian city of Ingolstadt to participate in the Walpurgisnacht rock festival in the 1975 novel Leviathan, the third book in Robert Anton Wilson’s insane Illuminatus! trilogy.
For over a week the musicians had been boarding planes and heading for Ingolstadt. As early as April 23, while Simon and Mary Lou listened to Clark Kent and His Supermen and George Dorn wrote about the sound of one eye opening, the Fillet of Soul, finding bookings sparse in London, drove into Ingolstadt in a Volvo painted seventeen Day-Glo colors and flaunting Ken Kesey's old slogan, "Furthur!"