Minor ninth
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A minor ninth (m9 or -9) is a compound musical interval spanning 13 semitones, or 1 semitone above an octave (thus it is enharmonically equivalent to an augmented octave). If transposed into a single octave, it becomes a minor second or major seventh. The minor ninth is rather dissonant in sound, and in European classical music, often appears as a suspension. Béla Bartók wrote a study in minor 9ths for piano. The fourth movement (an intermezzo) of Robert Schumann's Fasschingswank aus Wien, is a constructed to feature prominent notes of the melody a minor ninth above the accompaniment.
A minor ninth is a popular chord used in jazz and jazz arrangements, making especially common appearances in ballads.


