This pleasant melody, woven into a 4-voice cannon, surely a little game for the child genius, Mozart, is a brief sample of his simplicity and genius, and is as far as we know, the first vocal piece by Wolfgang Amadeus Mozart contained in a NFT. Undoubtedly an important piece in the history of technology and music. In addition, this NFT contains the only copy of the performance of the work. The file will be destroyed after mining, to make this NFT an absolutely unique piece.