Young Max is passionate about playing viola; music by Mozart in particular simply flows from his fingers. One day he meets old Mr Stegnelli and suddenly hears completely different music: an instrument that plays intricate melodies never heard before – is that perhaps jazz music? Thunderstruck, Max exclaims enthusiastically: “I’d like to be able to play like that too!” And asks himself in the same breath: “But how?” No sheet music anywhere. A secret that he can only listen to as if under a spell. The next day the old man is no longer to be heard anywhere – he has simply vanished. Only the cap he was wearing still lies there as if lost in a dream. The adventures Young Max experiences with the jazz cap are told here in music and in words.