Each of the four movements of this concert piece has its own character: the first is a free recitative, with slowly rolled chords and long trills, broken up by restless passages; the second is extremely rhythmic (utilizing a special way of playing both staccato and legato notes at the same time) with a recurring note that sounds much like a heartbeat; the third is completely atonal, moving back and forth from fast sections of single-line virtuosic mallet work to slow sections with expressive two-part chromaticism; the fourth is a simple folk-like melody, evoking a Bach chorale played by a music box.