whip, siren whistle, signal whistle, slide whistle, flexatone, chromatic harmonica (Chromonica in C, 270 by Hohner), glockenspiel, and xylophone. Music The five movements of the final version are: At the time of its composition, Ligeti was working on his first book of piano études, and the superimposed African rhythms, shifting accents, and changing tempos so characteristic of those pieces can be heard in the concerto as well. The first movement is similar to the polymetric concept used in Ligeti's first étude, Désordre. Rhythmically complex throughout, it uses two time signatures, and , simultaneously as well as complicated aksak rhythms. In addition, the left and right hands play two complementary six-note scales. The second movement, the only slow movement of the piece, begins without pause (attacca subito). It uses the lamento motif from the last movement of Ligeti's Horn Trio and his sixth piano étude, Automne à Varsovie. This motif also forms the basis of the third movement, another fast movement. According to Ligeti himself, the fourth movement, more fragmentary than the surrounding movements, is inspired by computer-generated images of fractals (like the Julia set and Mandelbrot set) that he saw. The fifth movement, similar to the first, uses three related time signatures simultaneously. References Compositions by György Ligeti Ligeti 1988 compositions