Introduction and the first phrase

The introduction starts with a dominant chord with a flat ninth. The ninth - the top note - descends until it reaches the chord's fifth. The sixteenth notes in the right-hand and the rhythmic pattern in the left-hand is repeated throughout the prelude:

Harmonic analysis of the first phrase (measures 2 to 9):

The right-hand sixteenth notes use numerous chromatic non-chord tones.

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