The Boombastic Ninjas compete in a rap battle against the T-Rex crew. The Ninjas soon have victory in the bag and Maurice is celebrated by his fans for his spontaneous lyrics. But things almost turn out differently, because Max thoroughly misses his improvised solo on the keyboard. But fortunately there is no improvisation in classical music, right? Wrong thinking! Even the great Beethoven improvised and in Mozart's concerto Köchelverzeichnis 466 there is even a minute-long passage that the pianist has to fill with his own spontaneously invented melodies.