The Bishop wants to hold a music competition between the cities of Linz and Salzburg. To prevent another brilliant success by Amadeus, Devilius obtains a strong sleeping potion, which should knock out Amadeus at the appropriate time. Devilius will then appear as the "black violinist" and claim victory for himself. To make matters worse, Amadeus' father, Leopold, took Amadeus' violin to a pawnbroker because he desperately needs money.