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In music, a minor seventh chord is a seventh chord composed of a root note, a minor third, a perfect fifth, and a minor seventh (1, ♭ 3, 5, ♭ 7). In other words, one could think of it as a minor triad with a minor seventh attached to it. [2] For example, the minor seventh chord built on A, commonly written as A− 7, has pitches A-C-E-G:
The diminished seventh chord is a four-note chord (a seventh chord) composed of a root note, together with a minor third, a diminished fifth, and a diminished seventh above the root: (1, ♭ 3, ♭ 5, 7). For example, the diminished seventh chord built on B, commonly written as B o 7, has pitches B-D-F-A ♭:
For example, the triad E ♭ –G–B in first inversion is G–B–E ♭, which is enharmonically equivalent to the augmented triad G–B–D ♯. One chord, with various spellings, may therefore have various harmonic functions in various keys. The seventh chords built on each scale degree follow a distinct pattern.
This chord progression instructs the performer to play, in sequence, a C major triad, an A minor chord, a D minor chord, and a G dominant seventh chord. In a jazz context, players have the freedom to add sevenths, ninths, and higher extensions to the chord. In some pop, rock and folk genres, triads are generally performed unless specified in ...
The most common chords are tertian, constructed using a sequence of major thirds (spanning 4 semitones) and/or minor thirds (3 semitones). Since there are 3 third intervals in a seventh chord (4 notes) and each can be major or minor, there are 7 possible permutations (the 8th one, consisted of four major thirds, results in a non-seventh augmented chord, since a major third equally divides the ...
Another well-known example occurs between the first two notes of the introduction to the main theme music from Star Trek: The Original Series theme. [4] The most common occurrence of the minor seventh is built on the root of the prevailing key's dominant triad, producing the all-important dominant seventh chord.
Like the supertonic minor triad found in a major key, the supertonic diminished triad has a predominant function, almost always resolving to a dominant functioning chord. [7] If the music is in a minor key, diminished triads can also be found on the raised seventh note, ♯ vii o.
The diminished seventh is used quite readily in the minor key, where it is present in the harmonic minor scale between the seventh scale step and the sixth scale step in the octave above. In 12-tone equal temperament , a diminished seventh is equal to nine semitones, a ratio of 2 9/12 :1 (approximately 1.6818), or 900 cents, and is ...