"Estructuras de Acordes con 7"

chord name triad seventh abbreviation other comments dominant seventh major minor Mm7 the most common type of 7th chord having the simplest name, just the number 7 added to the root letter. For example: C7, F7, E7 all indicate dominant 7th chords. major seventh 'major major' chord Delta chord or Δ chord major major MM7 named with the abbreviation Ma7 or Δ For example: CMa7, CΔ, F#Ma7 indicate major 7th chords. The abbreviation M7 may also be used. For example: CM7 minor seventh minor minor mm7 named with the addition of mi7 or -7 to the letter name. For example: Cmi7, Gmi7, Dmi7 all indicate minor 7th chords. C-7, D-7, A-7 may also be used. diminished seventh (also called 'fully diminished seventh') diminished diminished dd7 named with the small raised circle and a 7. For example: C°7, B°7, and D°7 all indicate a fully diminished 7th chord. half diminished seventh (also called 'minor seventh flat five' or 'Tristan chord') diminished minor dm7 the name relates them to the minor 7th, but with a lowered or flattened 5th. For example: Cmi7(b5), Ami7(b5) indicate half diminished chords. Note: Sometimes half diminished is indicted by a small circle with a slash through it (ø). This symbol is more common in Roman numeral analysis than chord names. augmented triad, major seventh (also called 'augmented major seventh') augmented major aM7 augmented triad, minor seventh (also called 'augmented seventh' or 'augmented minor 7th') augmented minor am7 minor triad, major seventh minor Delta chord or -Δ chord (also called 'minor major seventh') minor major mM7 'Delta' notation is often used for chords like this. C-Δ is a seventh chord with a minor third, in this case the notes C, E flat, G, B We also summarise the degree of the scale where each type of seventh chord occurs. major scale natural minor scale harmonic minor scale melodic minor scale dominant 7th. V VII V IV, V major 7th. Delta chord I, IV III, VI VI minor 7th. II, III, VI I, IV, V IV II diminished 7th. VII half diminished 7th. minor 7th flat 5 VII II II VI, VII augmented major 7th augmented triad, major seventh III III minor triad, major seventh minor Delta chord I I

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Dominant Seventh Chord One area of confusion when naming or identifying seventh chords is the use of the term dominant seventh chord. If you look at the table above summarising the degree of the scale where each type of seventh chord occurs, you will see that the dominant seventh need not lie only on the Vth degree of the scale, the degree we call the dominant. Indeed, in the natural minor scale, the dominant seventh chord lies on the VIIth degree not on the Vth degree. The point to remember is that the dominant seventh chord is any chord formed by adding a minor seventh to a major triad. Remember too that the chord's note name is determined by its root note. So the chord G B D F is written G7 because the root note is G. G B D is a major triad and F is the minor seventh above G. This chord, therefore, is a dominant seventh chord. In the key of C major, the notes G B D F form a seventh chord on the Vth degree, i.e. a dominant seventh on the dominant of the scale. This is also true for the C minor natural and C minor melodic scales. However, the same notes, G B D F, are a G7 chord and a dominant seventh on the fourth (IV) degree of the D melodic minor scale. For completeness, we note finally that the notes G B D F are also a G7 chord and a dominant seventh on the seventh (VII) degree of the A natural minor scale.

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Naming Seventh Chords One useful convention for naming any seventh chord is: root pitch letter, then chord tokens representing triad quality and seventh quality For example, an Ab major minor 7 chord: the first term (Ab) tells us the root of the chord; the second term (major) identifies the quality of the triad that forms the lower three notes of the seventh chord; and, the third term (minor) identifies the quality of the interval of the seventh formed between the root and the seventh. long name examples short or abbreviated name(s) chord notes (root to seventh) F major major 7 FM7, FMaj7, F Major 7 F A C E F major minor 7 F7, also called 'dominant 7' F A C Eb F minor major 7 FmM7 F Ab C E F minor minor 7 Fm7, Fmin7, F minor 7 F Ab C Eb F diminished major 7 FdM7 F Ab Cb E F diminished minor 7 Fø7, Fm7b5 F Ab Cb Eb F augmented major 7 F+M7, FM7#5 F A C# E F augmented minor 7 F+7, F7#5 F A C# Eb F diminished 7 F°7, Fdim7 F Ab Cb Ebb

Fuente:http://www.dolmetsch.com/musictheory17.htm