Ninth

In music, a ninth is a compound interval consisting of an octave plus a second.

This article is about the musical interval. For the ordinal of 9, see 9. For the chord, see Ninth chord. For the curse, see Curse of the ninth. For the symphony, see Symphony No. 9 (Beethoven). For the 2011 albums, see Ninth (Peter Murphy album) and Ninth (The Gazette album).
major ninth
Inverseminor seventh
Name
Other namescompound second
AbbreviationM9
Size
Semitones14
Cents
12-Tone equal temperament1400.0
minor ninth
Inversemajor seventh
Name
Abbreviationm9
Size
Semitones13
Cents
12-Tone equal temperament1300.0

Like the second, the interval of a ninth is classified as a dissonance in common practice tonality. Since a ninth is an octave larger than a second, its sonority level is considered less dense.

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