Harmonic Structure for Celestial Excursions

The following chart shows the underlying harmony of the opera Celestial Excursions, scene by scene. The quarter-notes with initials indicate the reciting tones for the solo singers: Jacqueline Humbert, Joan La Barbara, Sam Ashley, Thomas Buckner, and Robert Ashley. Notice that the entire piece uses only the C-major scale, with any pitch but C in the bass:

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