FJH Music Measures of Success F Horn Book 1 Measures of Success F Horn Book 1 Measures of Success is divided into six chapters (Opus 1 through 6) Each "Opus" is followed by a full-page assessment Students are able to attain achievable benchmarks throughout the method, which keeps them motivated, excited, and playing their instruments Music history is presented simultaneously with art, literature, and world history, giving students a broad picture of social and artistic events of a certain time period