Chance composition; For any melody instrument. "During the performance, portions of what the instrumentalist plays are recorded ... Through a feedback circuit, the recorded sections are more or less densely superimposed, possibly transformed, and with a varied time delay, played back over two speaker groups, thus being mixed in with the playing of the soloist. Four assistants are required to operate the technical equipment."

Instructions for performance in German, English, and French (p.1-30); score consists of "Note pages" ([6] l.) and "Form schemes" ([6] l.)

Cover bears label: Sole agent: Joseph Boonin Music Publications, So. Hackensack, N.J