When None ( from Latin Nonus: " the ninth " ) is called in music an interval, which is composed of an octave and second, with nine pitches of a diatonic, heptatonic scale spans (eg, c- d ').

Sample sheet: None intervals

The major ninth (a) comprises fourteen, the minor ninth ( b ) thirteen semitones. In counterpoint and harmonic set ninths are normally to be treated as seconds. In the functional harmony of None esp. falls in Dominantseptnonakkord, in jazz harmony as the fourth third above the root note ( c ) a special role. When None is a psychoacoustic effect to fruition. Such a harmony of great or minor ninth is the root perceived as much less unpleasant than the harmony of large or small second with the root. Although actually dissonant chord is formed from root, perfect fifth and major ninth ( Quint ninth chord ) already almost perceived to be consonant if in Pythagorean ( without using the Pythagorean wolf fifth ), pure (only applies to the built-up on the root of the scale chord ) or gleichstufiger mood is played.

Related to the partials series, for example in organ stops, the ninth partial tone is referred to as a None. This None has the next lower octave frequency ratio of 9:8. The None takes within the partials series a special position. It is not only the 9th partial tone to tone, but at the same time also the third partial tone of the 3rd partial's ( " fifth " ) to the root. This is also a reason for the low dissonance effect when the major ninth heard in a chord with the root and fifth in Pythagorean, pure or gleichstufiger mood.