In music, the seventh factor of a chord is the note or pitch seven scale degrees above the root or tonal center. When the seventh is the bass note, or lowest note, of the expressed chord, the chord is in third inversion .
Conventionally, the seventh is fourth in importance to the root, fifth, and third, with third inversion being the third strongest inversion and the seventh variably minor or major. In jazz chords and theory, the seventh is required in a seventh chord, and the fifth is often omitted in preference for it and the chord quality determining third, chord extensions, and additions.
The seventh is most commonly minor or major (in C, B♭ or B♮) or less often diminished or augmented (B=A or B♯=C).
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