What is a Major Ninth?

A major ninth is a musical interval that spans fourteen semitones. It can be thought of as the distance of a major second extended by an octave. For example, the interval between C and D an octave higher is considered a major ninth.

The major ninth has a smooth and open sound that is often considered more consonant than many other extended intervals. When the two notes are played together, the interval creates a sense of spaciousness and brightness. Because of this pleasing quality, major ninths are frequently used in melodic writing and harmonic textures.

Major ninth intervals are commonly found in extended chords and modern harmony, especially in jazz, soul, and contemporary music. For example, a Cmaj9 chord includes the notes C, E, G, B, and D, with the interval between C and the higher D forming a major ninth. This interval helps add richness, color, and depth to musical arrangements.