Stumbling upon an ancient book in the library, young musicians Ludwig, Amadeus, and Clara are whisked away on a journey through the history of classical music. Through orchestral parties and ballet premieres, the musicians listen to the most famous symphonies and concertos, meet composers like Beethoven, Mozart, and Haydn, and learn about the distinct styles of the Baroque, Classical, Romantic, and 20th-century eras of classical music.