The orchestral works on this recording include two of Xenakis’ adventurous spatialized works along with Metastaseis, the work with which he emerged onto the international avant-garde scene. Metastaseis A is the original version, which is better known by its revision, Metastaseis B. The revision was the result of conductor Hermann Scherchen, who was critical of the size of the score and of elements of its instrumentation. He agreed to perform it if certain revisions were made. Ultimately, the première of the revised version, Metastaseis B, would be conducted by Hans Rosbaud at Donaueschingen in 1955, where it created a sensation. The public would have to wait until after the composer’s death before hearing the original version of Metastaseis A, which took place in 2008 in Torino under the direction of Arturo Tamayo, who conducts the work in this recording, its first commercial release. Xenakis explained that the sound world of Metastaseis was inspired by his experiences as a member of the student Resistance during the Nazi occupation of Greece. In Nomos Gamma, the listener is struck by the increased size of the percussion section, which rings the orchestra and audience, lending a kind of ritual brutality to the piece.