Sisì , a graceful music box ballerina in a tutu, steps down from her revolving pedestal to discover if there's any other music besides the one she's used to. Her curiosity will lead her to discover Ottone's bizarre cellar, a veritable musical emporium with clusters of notes, rolls of melodies, and grains of rhythm, sold after being weighed on a special emotional scale. But all this isn't enough: to make good music, you need to know a few secrets and know how to put all these elements together, and Ottone will reveal them to us!