Concerto-Sonata Form
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Section four continues the use of sequence - circle of fifths mm. 170-176
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Melodically, using a fragment of the D theme, trading between the clarinet and flute.
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This section uses only winds and piano.
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The concluding chord (m. 177) is an Aug. 6th chord.
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Section five is the retransition (m. 178) - prolonging the dominant for 20 measures (dominant pedal).
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Based on the D theme motive - note the mirror writing in the winds (i.e., m. 181).
d - G - C - F - b - E - a