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I have updated the original files to correct the hidden parallel octaves I committed in measure 53. The error is now included in the errata. Thanks to Leightwing for his sharp ears and eagle eyes.
Paul Poehler - per your request and pursuant to our discussion, I have (finally) attached the Agnus Dei of my Missa Brevis hereto as a MIDI. If you'd like a PDF, I can e-mail it to you.
The brief fugato I mentioned begins at measure 53, after the key and metre change at the dona nobis pacem. The subject of the fugue is a reprise of the main theme of the Gloria to the dona text.
Note the entrance of the bass at measure 63; it begins on B, the mediant of G on which the tenor begins the exposition, which is rather irregular; by sheer luck, I get away with it because in that tonality, the bass' statement of the subject ends squarely on G, which leads to a cadence in the tonic key of the movement. I also get away with it because this is not a stand-alone fugue, nor is it by any means a complete one: after the exposition, there is only one more statement of the subject in the soprano before I take off into an extended pedal point under partial harmonic statements of the subject in all four parts (measures 68-69) in stretto - the alto and tenor with simultaneous statements (peculiar in that the opening leap of a fourth is augmented in both), followed by simultaneous statements in the soprano and bass two beats later, the bass' statement in inversion - after which there is an elaborate modulation over the pedal point to a deceptive cadence and an Adagio coda.
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