““It was Haydn and Mozart who really cracked the sonata, but it was Beethoven who reinvented it, just as he reinvented the symphony. Bach was king of the Baroque; Mozart and Haydn were kings of the Classical; Brahms, Chopin, Liszt, and Berlioz were the great Romantics. Bruckner, Mahler, and Wagner brought music into the twentieth century; Stravinsky and Schoenberg redefined harmony. But Beethoven was in a class of his own. He didn’t write music to praise God. He didn’t write it to earn a living. Beethoven wrote music because he had to.””