Eberhard Blum, flute
Steffen Schleiermacher, piano
This version of 4 Systems, from 1954, is performed not only on flutes (Eberhard Blum recorded an entire disc of this composition for overdubbed flutes for Hat Hut Records) but also for the flute and piano, which is, while not directly called for in the score, the instrument that most fits the harmonic bill with its extended tonalities and inexact pitches. [allmusic.com]