Chopin, Op. 28, No. 9

Gap-fill exercise

The key of is expressed in the first phrase (mm. 1-4) of this -phrase piece. The Prelude shifts to major in m. , but returns to major in m. . These two keys are related by , with the G# spelled as . Similar to Schumann's Papillons, the key is approached again through its . Again, if spelled , the of E is in a relation with Ab. The second phrase begins in m. 5 with a simple to progression. The next chord would be analyzed as of , although it could also be analyzed as a . The first chord of m. 6 would be labeled , and the first chord of m. 7 would be labeled . The five chords listed from m. 5 to m. 7 above are related by , and can be arranged so that their roots span B- - - -A. The second chord in m. 7 is an enharmonically-spelled that the key of Ab. Including Ab, there are thus mediants of major in the second phrase. The G major and C major chords introduce the notes , and into the E major tonality of the Prelude.