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In page Music for Flute, Strings, and Percussion:

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The instruments are divided into two sections, one of which is tuned a quarter-tone lower than the other.[1] Gubaidulina (2001) describes, "in this way the potential of treating both halves as 'light' and 'shadow' emerges."[citation needed] She uses three chords, one major, one minor, and one whose third is exactly halfway between ("this triad possesses architectural significance, but also a symbolic meaning") being used at importance cadence points also determined by the five open strings of the higher orchestra section. The flute is in tune with this higher section, but through microintervals and glissandos also coincides with the lower section.