Princess Antoinette persuades Amadeus to uncover the secret of Ybbs, a nearby monastery. Amadeus convinces his parents to visit Ybbs on their way back home to Salzburg, where he immediately starts looking for the secret. Devilius and his gang get lost in a heavy snowfall and also end up at the monastery. They quietly creep around and cause confusion among the monks. The secret is finally revealed as a beautiful organ hidden behind a wall. Amadeus presents a small concert on the organ and Devilius, Monti and Mario flee from the monks in a mad rush - on the backs of two pigs! The Music: "Violin Sonata in A" K. 526; "Symphony No. 40 in G Minor" K. 550; "The Abduction from the Seraglio" K. 384; et al. Additional Content: Monti, with Pumperl's help, explains the difference between a piano and organ, and describes the sounds pipes and bellows create on a typical organ. An inside construction drawing shows this connection and how it works.