Pioneering efforts in experimental music from Karlheinz Stockhausen and Pierre Boulez – provacative, influential 50s material from these towering figures compiled for this CD from El Records. Stockhausen's "Etude Concrete" and Nr 5 Zietmasse (Time-Measures) For Five Woodwinds kick it off, the former a blunt, statically missive, the latter a playfully tense piece. These are followed by Boulez Le Marteau Sans Maitre recordings from 1953-1955, 9 pieces in all, To close, Stockhausen's
Klavierstuck XI pieces from 1956, with David Tudor on piano.