Devilius maliciously spreads the rumor that all of Amadeus' compositions were written by his father, Leopold Mozart. As a result, the Bishop organizes a competition in which Amadeus must compete against Devilius. An herbalist mixes a special ink for Devilius that makes Amadeus' composition disappear. Can Amadeus uncover Devilius' terrible plot before time runs out? The Music: "Serenade in G" ("A Little Serenade") K. 525; Aria of the "Koenigin der Nacht" from "The Magic Flute" K. 620; "Clarinet Concerto in A" K. 622; et al.
The Bishop would like to give Countess Kussmaul, a patron and great lover of Mozart's music, one of Amadeus' compositions as a birthday gift. Devilius bets the Bishop that Amadeus cannot deliver a piece in such a short time. Confident of Mozart's talent as a composer, the Bishop wagers half of his royal household. In an attempt to win the wager, Devilius and Monti the Rat devise a villainous plan. Will Mozart finish his composition on time or will the Bishop make Devilius a wealthy man? The Music: "Violin Sonata in F" K. 376; "Horn Concerto in E Flat Major" K. 417; "Minuet" K. 94; et al.
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. Can Amadeus shine without his violin? Will the sleeping potion work? Or, will Devilius once again leave the concert hall as the loser?
On their way to Vienna, Amadeus and his sister Nannerl follow a troupe of actors and accidentally board the wrong ship. While their parents sail on the Danube towards Vienna, the two children enjoy their time aboard the pleasure boat. They cap off the performance of the acting troupe with their own musical accompaniment. Along the way, they help bring peace between an angry father and his daughter and future son-in-law. But will the Mozart siblings ever catch up with their parents' ship? The Music: "Sonata in C Major" K. 545; "Flute Quartet in D" K.
After their boat trip on the Danube, the Mozarts land in Vienna, along with Devilius' deceitful trio. To prevent the Mozarts from entering Vienna, they steal Amadeus' father Leopold's wallet. This leads to big complications; customs officers mistake the Mozarts for merchants and ask them to pay high tariffs. Amadeus gets the whole harbor - including Empress Maria Theresia and her children - dancing with a sensational musical performance that convinces the customs officers. Now, nothing stands in the way of a visit to the imperial castle. The Music: "Divertimento No. 17" K.
On the way to their guesthouse in Vienna, the Mozarts witness a terrible incident in which the arrogant son of a nobleman mistreats an old woman and her grandchildren. Outraged, Amadeus challenges the man to a duel - "whip against violin." He deliberately plays the violin badly so that the horse of the evil young man runs away. News of this incident quickly spreads around Vienna. Amadeus gets to know two young street musicians and joins them to form a trio, playing in the music cafes of Vienna.
The invitation to the imperial court still hasn't arrived. Money is short, and Devilius manipulates the innkeeper to demand the hotel bill from Amadeus' father, Leopold, in advance. Leopold has no other option but to return to Salzburg. Amadeus attempts to meet the Empress during a visit to the opera, without success. As the Mozarts make their way home in an oxcart, the invitation to the imperial court finally arrives! In a race against time, the misled innkeeper tries to reach the Mozarts to bring them back.
Amadeus and his dog, Pumperl, fetch some medicine for Amadeus' sister Nannerl. On the way, Pumperl follows another dog and disappears. While Amadeus searches for Pumperl, he stumbles on a performing bear at the marketplace. He receives gold coins (ducats) from the crowd for his violin playing. Devillius, green with envy, devises a plan to catapult his nephew Mario into Amadeus' place. But Mario's fiddling instead causes the bear to flee through the alleys of Vienna. Eventually, Amadeus' violin playing prevents even worse mishaps. The Music: "Bassoon Concerto in B Major" K.
Amadeus, tired of practicing on a "silent piano" in his hotel room, is thrilled to learn that a grand piano sits in the ballroom for a "Russian Evening." While he secretly plays the piano, one of the keys breaks. Devilius wants to impress the Russian nobility and manages to put the pianist, due to perform that night, out of action. In the meantime, Amadeus and Nannerl, with the help of Pumperl, try to earn some money on the street so they can buy a new key from the piano maker. Can they pull it off in time for the special event? Who will perform that evening?
The empress invites the Mozarts to the imperial court again. The children persuade two of the hotel employees to pose as their parents (who can't be reached) and accompany them to the court. This leads to problems when the real parents hear about the invitation and rush to the palace. In the meantime, Amadeus and Nannerl enjoy sliding on the polished floors of the palace with Marie Antoinette, the empress' youngest daughter. Will Devilius stop another one of Amadeus' successes, or will he slip up? The Music: "Organ Fantasy in F Minor" K. 608; et al.