Ludwig van Beethoven is attending a rehearsal of one of his symphonies. His secretary Anton Schindler bustles around him tirelessly and subserviently. Beethoven is very unhappy with the rehearsal; his ideas about how fast an allegro should be are totally different from those of the orchestra. He is annoyed. But the solution to the tempo problem appears in the persons of the inventors Johann and Leonhard Maelzel. Whereas Beethoven believes in art, the Maelzels believe in technology. Their latest invention concerns both worlds: a timekeeping device called “metronome”. This should make an end to quarrels between orchestras and composers. Beethoven, though, is more interested in the Maelzels’ talented assistant Elise. She is fascinated by the gruff genius, too. But Leonhard Maelzel gets jealous because he wants to marry Elise himself. Despite this, the Maelzels develop a mechanical orchestra for Beethoven with 259 instruments, the Panharmonicon. But the composer and the inventor start arguing while Elise is trying to unite technology and art.