While working on the score of his ''Concerto for Orchestra'', the composition in which his original treatment of folk-music reached its stylistic perfection, Lutosławski completed the ''Bucolics'' for the piano, based on tunes from Kurpie (a district lying to the north-east of Warsaw) collected by the Rev. Władysław Skierkowski. With astounding inventiveness Lutosławski has here applied a number of subtle methods, always perfectly fitted to the folk-music material, while showing the expressive qualities of the original in completely new light. The exemplary balance of the means used - the texture and the miniature form - is also especially noteworthy.