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The fundamental chords of tonal music—major and minor triads and also seventh chords—all contain fifth intervals.. Perfect fifths are contained in major and minor triads and in particular seventh chords (especially major-minor sevenths with dominant function, major sevenths, and minor sevenths).
Fifth (G), in red, of a C major chord (Play ⓘ). Second inversion C major triad. The fifth is the bass. In music, the fifth factor of a chord is the note or pitch that is the fifth scale degree, counting the root or tonal center. When the fifth is the bass note, or lowest note, of the expressed chord, the chord is in second inversion Play ⓘ.
In music theory, the half-diminished seventh chord (also known as a half-diminished chord or a minor seventh flat five chord) is a seventh chord composed of a root note, together with a minor third, a diminished fifth, and a minor seventh (1, ♭ 3, ♭ 5, ♭ 7).
Its relative minor is E-flat minor (or enharmonically D-sharp minor). Its parallel minor, G-flat minor, is usually replaced by F-sharp minor, since G-flat minor's two double-flats make it generally impractical to use. Its direct enharmonic equivalent, F-sharp major, contains six sharps. The G-flat major scale is:
In this diatonic version of the circle, one of the fifths is not a true fifth: it is a tritone (or a diminished fifth), e.g. between F and B in the "natural" diatonic scale (i.e. without sharps or flats). Here is how the circle of fifths derives, through permutation from the diatonic major scale:
In that system (which is the fundamental musical grammar of Baroque and Classical music), the tritone is one of the defining intervals of the dominant-seventh chord and two tritones separated by a minor third give the fully diminished seventh chord its characteristic sound. In minor, the diminished triad (comprising two minor thirds, which ...
However, in common guitar tabs notation, a minor key is designated with a lowercase "m". For example, A-minor is "Am" and D-sharp minor is "D ♯ m"). The small interval between equivalent notes, such as F-sharp and G-flat, is the Pythagorean comma .
In music theory, the dominant seventh flat five chord is a seventh chord composed of a root note, together with a major third, a diminished fifth, and a minor seventh above the root (1, ♮ 3, ♭ 5 and ♭ 7). For example, the dominant seventh flat five chord built on G, commonly written as G 7 ♭ 5, is composed of the pitches G–B–D ♭ –F: