Imre Mezõ (born 1932) composed several popular works for children and young people studying music. His most recent collection is extraordinary in that all the 153 tiny pieces are based on the same Hungarian folk song, offering a myriad of ways and options of presenting and elaborating the same melody without altering it. The variations are grouped by key and, within each chapter, are placed in order of difficulty. This publication is not only recommended to beginners or more advanced pupils undergoing traditional musical tuition, but also to those interested in the secrets of composition and musical structures. This publication is printed on high-quality, age-resistant paper that is produced in an environmentally-friendly, climate-neutral manner using renewable raw materials.