Pee is a cute little worker bear. Pupù, on the other hand, is a greedy and chubby little bird while Rosmarina is an affectionate bunny. The three little heroes find themselves having to look for the perpetrator of a theft of musical scores. To identify the culprit, they will have to deal with some great operas, transforming them into tasty and brilliant parodies.

Pipì, Pupù and Rosmarina, flanked by new and funny characters, travel through the world of opera to tell children about its repertoire. Three short animated films in which the three little friends entertain the audience by developing their vision of the story and singing the famous arias of three classical music masterpieces: "Don Quichotte" by Jules Massenet, "Lo schiaccianoci" by Pëtr Il'ič Čajkovskij and "L'italiana in Algeri" by Gioachino Rossini.