A four-voice fughetta in the B Blues Phrygian mode. This mode arises when combining the Phrygian mode (third mode of major / Ionian; alternatively, natural minor / Aeolian with a flattened supertonic) with the Blues scale (a hexatonic [six-note] scale which interpolates a "bluesy" semitone between the subdominant and dominant degrees), and consists of the following intervals in its ascending form: semitone, tone, tone, semitone, semitone, augmented second, tone. Besides exploring the bluesy qualities of the mode, this fughetta exploits the technique of stretto, or overlapping entries of the fugal subject in quick succession, culminating in a stretto coda which combines an augmented form of the subject in the highest voice with the subject in inversion. Note, too, the relative prominence of the countersubject and the quasi-baroque sequential episodes.
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