A four-voice fughetta in the E Mixolydian ♭6 mode. This mode is also known as the Mixolydian ♭13 mode or Aeolian Major mode, and consists of the following intervals in its ascending form: tone, tone, semitone, tone, semitone, tone, tone. A somewhat unstable, searching (though not particularly dissonant), and arguably mystical quality is inherent to this mode.
The full engraved score, included for your perusal:
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