During the 1950s and early 1960s‚ Iannis Xenakis represented an alternative avant­garde‚ with a radical approach to form and texture that rejected the serial mechanics of Boulez and Stockhausen‚ and involved a uniquely intense interpretation of ideas about probability and randomnessÊ–Êa world away from John Cage’s laid­back experiments[…] The two short orchestral works‚ Metastasis and Pithoprakta‚ are undoubtedly far more austere‚ more primitive in their overall effect‚ than the exuberant‚ hyperactive Eonta‚ whose ferociously demanding writing for piano and five brass players pulsates with the kind of creative energy that the orchestral pieces seek to suppress.