Theory Analysis on Haydn's Piano Sonata in Bb Major

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Haydn Piano Sonata in Bb Major

Haydn's Piano Sonata in Bb major has three clearly defined sections: the exposition, the development, and the recapitulation. In the exposition, the thematic statement from measure 1 through 10 is more or less the introduction followed by a theme in parallel period from measures 11 to beat two of 22. Up to this point we are in the key of Bb major, ending on a half cadence. Though it stays in this key, E is tonicized with a five of four in measures 11 and 16. Next is what I consider a bridge section in F major, connecting the themes in Bb to the themes in F. The reason I see it as a bridge phrase is for three reasons: ascending patterns, the augmented sixth chords to five, and the E natural in the
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As far as ascending and descending lines go, a lot of them are the same from the exposition, but they are just in different keys, such as 73 through 76, and 79 through the down beat of 84. The first is ascending in the key of F major as opposed to the key of Bb major in the introduction, and the second is descending in the key of C major as opposed to measures 31 through 35 in F major. This leads us to the third and final section of the sonata: the recapitulation. It begins in measure 102 and goes to the end of the piece in measure 148. The entire recapitulation is in the key of Bb major, but includes several thematic statements from both the exposition and the development. It begins with the same exact introduction from the exposition; same theme, same key (Bb). Then, it gets thrown off at 108, when it doesn’t quite follow the introduction. Basically, measures 7 through 10 are deleted from the re-statement, and instead takes us to the equivalency of the bridge section, but in Bb instead of F. That part is very crucial I feel, because when it was in F, its purpose was to sound like it needed to go on, whereas in Bb, it sounds like we’re coming to a close by returning to the original key. So in conclusion, from 110 to the end, it is exactly the same as the second part of the exposition, except instead of being in F, it is in Bb. If I may say so, this

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