La fille aux cheveux de lin - Extended Harmony

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 9^th and 11^th:

This chord has a dominant of Gb function.

Measure 12, Gb with 9^th and 11^th:

Measure 17, Abm7 with 9^th and Db7 with 9^th:

Measure 18, Bb7 with 9^th and 11^th:

This chord has a dominant of Eb function.