One of the many, many rock bands that traveled to the Bavarian city of Ingolstadt to participate in the big Walpurgisnacht rock festival in the 1975 novel Leviathan, the third book in Robert Anton Wilson’s insane Illuminatus! trilogy. They only get mentioned in a giant list of bands.
On April 29, while Danny Pricefixer listened raptly to Mama Sutra, the deluge descended upon Ingolstadt: Buses, trucks, station wagons, special trains, and every manner of transport except dog sleds, brought in the Wonders of the Invisible World, Maule's Curse, the Jesus Head Trip, Ahab and His Amputation, the Horseless Headsmen, the Leaves of Grass, the Gettysburg Address, the Rosy-Fingered Dawn, the Wine-Dark Sea, Nirvana, the Net of Jewels, Here Comes Everybody, the Pisan Cantos, the Snows of Yesteryear, the Pink Dimension, the Goose in the Bottle, the Incredible Hulk, the Third Bardo, Aversion Therapy, the Irresistible Force, MC Squared, the Enclosure Acts, Perpetual Emotion, the 99-Year Lease, the Immovable Object, Spaceship Earth, the Radiocarbon Method, the Rebel Yell, the Clenched Fist, the Doomsday Machine, the Rand Scenario, the United States Commitment, the Entwives, the Players of Null-A, the Prelude to Space, Thunder and Roses, Armageddon, the Time Machine, the Mason Word, the Monkey Business, the Works, the Eight of Swords, Gorilla Warfare, the Box Lunch, the Primate Kingdom, the New Aeon, the Enola Gay, the Octet Truss, the Stochastic Process, the Fluxions, the Burning House, the Phantom Captain, the Decline of the West, the Duelists, the Call of the Wild, Consciousness III, the Reorganized Church of the Latter-Day Saints, Standard Oil of Ohio, the Zig-Zag Men, the Rubble Risers, the Children of Ra, TNT, Acceptable Radiation, the Pollution Level, the Great Beast, the Whores of Babylon, the Waste Land, the Ugly Truth, the Final Diagnosis, Solution Unsatisfactory, the Heat Death of the Universe, Mere Noise, I Opening, the Nine Unknown Men, the Horse of Another Color, the Falling Rock Zone, the Ascent of the Serpent, Reddy Willing and Unable, the Civic Monster, Hercules and the Tortoise, the Middle Pillar, the Deleted Expletive, Deep Quote, LuCiFeR, the Dog Star, Nuthin' Sirius, and Preparation H.
[https://en.wikipedia.org/wiki/Ent#Entwives Entwives are female ents, from Tolkien's Lord of the Rings trilogy.