1. The Thin Red Line: Guido of Arezzo and the Invention of Notation -- 2. Vatican Secrets -- 3. The Inventing of Opera -- 4. 'Je Suis Compositeur' -- 5. Accidentals will Happen: The Invention of Equal Temperament -- 6. Bartolomeo Cristofori and his Amazing Loud and Soft Machine -- 7. Chosen People -- 8. Mary and Her Little Lamb: The Invention of Recorded Sound.