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How is the final chorus related to the opening chorus?
It is exactly the same.
Describe the accompaniment of the outro section.
The music is based on the syncopated, swung rock n roll/blues vamp from the first instrumental section.
How is the harmony ambiguous in the outro section?
The chords used are F, Bb then Eb/G. This creates two conflicting sounds. F-Bb-Eb would be ii-V-I in Eb major. F is chord 2, Bb is chord 5 and Eb is chord 1. However, by writing the Eb chord in 1st inversion (G is in the bass), it weakens the final perfect cadence Bb-Eb (V-I).
This causes our ears to latch one to the more solid perfect cadence created by F-Bb as both of these chord are in root position. Therefore we are more like ly to hear Eb/G-F-Bb which is IV-V-I in Bb major. This causes ambiguity as the music wants to be in Eb major and therefore sounds unfinished and unsatisfying as we never hear a solid cadence in this key. At the end when the music just plays Eb major over and overt feels wrong as we are still hearing it as chord IV (4).
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