War for the Oaks

War for the Oaks (1987) is a fantasy novel by American writer Emma Bull. The book tells the story of Eddi McCandry, a rock musician who finds herself unwillingly pulled into the supernatural faerie conflict between good and evil. War for the Oaks is one of the first works in the subgenre of urban fantasy: although it involves supernatural characters, the setting (Minneapolis) is decidedly real-world.