José Rodríguez Alvira
The use of ninths, elevenths and thirteen chords was common in Debussy's music. Follows some examples of these types of chords in this prelude.
Measure 9, Db7 with 9th and 11th:
This chord has a dominant of Gb function.
Measure 12, Gb with 9th and 11th:
Measure 17, Abm7 with 9th and Db7 with 9th:
Measure 18, Bb7 with 9th and 11th:
This chord has a dominant of Eb function.