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The major seventh chord, sometimes also called a Delta chord, can be written as maj 7, M 7, Δ, ⑦, etc. The "7" does not have to be superscripted, but if it is, then any alterations, added tones, or omissions are usually also superscripted. For example, the major seventh chord built on C, commonly written as Cmaj 7, has pitches C–E–G–B:
Dominant seventh chords are often built on the fifth scale degree (or dominant) of a key. For instance, in the C major scale, G is the fifth note of the scale, and the seventh chord built on G is the dominant seventh chord, G 7 (shown above). In this chord, F is a minor seventh above G.
In this case, the chord is viewed as a C major seventh chord (CM 7) in which the third note is an augmented fifth from root (G ♯), rather than a perfect fifth from root (G). All chord names and symbols including altered fifths, i.e., augmented (♯ 5, +5, aug5) or diminished (♭ 5, o 5, dim5) fifths can be interpreted in a similar way.
Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style ...
When the type is not specified at all, the triad is assumed to be major, and the seventh is understood as a minor seventh (e.g. a "C" chord is a "C major triad", and a "C 7" chord is a "C major/minor seventh chord", also known as a "C dominant seventh chord"). For symbols used for seventh chords, see also Popular music symbols § Seventh chords.
For example, while a classical piece and a swing arrangement might use the following chord sequence in the key of C major: "C – Am – Dm – G 7", a bebop bandleader might reharmonize the same progression as "C 7 – A 7 – D 7 – G 7", making a sequence of dominant seventh chords, so long as the new dominant chord harmonies were ...
Harmonic minor contains seven types of seventh chords: a minor major seventh chord (i m(maj7)), a half-diminished seventh chord (ii m7(−5)), an augmented major seventh chord (III aug(maj7)), a minor seventh chord (iv m7), a dominant seventh chord (V 7), a major seventh chord (VI maj7), and a diminished seventh chord (vii dim7).
The dominant 7 ♯ 11 or Lydian dominant (C 7 ♯ 11) comprises the notes: . r, 3, (5), ♭ 7, (9), ♯ 11, (13) (Note that in jazz lead sheet notation, upper extensions (intervals beyond the 7th) aren't named unless they are altered; alternatively, when including the 9th and 13th this chord could be called a C 13 ♯ 11.)