This books draws on more than forty years of the author´s close study of Stockhausen and the sources of his inspiration, while functioning as a catalogue raisonné os Stockhausen´s complete output. The author wisely ovoids techincal analysis, focusing instead on the music´s aesthetic and practical assumptions. Whith plentiful citations from the history of radio, film, spund recording, and contemporary science and technology, this book is organized chronologically and contains ample comentary on the composer´s sources of inspiration.