A common enhancement to triadic harmony wherein a fourth pitch is added to the triad, up another third, thus: root + 3rd + 5th + 7th. The most common of these chords is the one where you add a flat 7th scale degree to the dominant chord (V). This becomes a so-called dominant seventh chord, and makes the pull to tonic even stronger.
chord consisting of the first, third, fifth, and flatted seventh of a major scale, also called the "dominant seventh chord"
a triad with a seventh added
a chord or triad which has a note the seventh above the tonic in it
a major chord with one extra note
a series of stacked thirds forming a four-note chord.
Four-note combination consisting of a triad with another third added on top; spans a seventh between its lowest and highest tones.
A chord consisting of a major third, a perfect fifth, and a minor seventh. For example, a D seventh chord (D7) contains D, F#, A, and C. Major seventh chords (notated maj7) contain a major seventh instead of a minor seventh.
When a seventh (above the root) is added to a triad (root, third, fifth), the result is a seventh chord, e.g. the dominant triad in the key of C major, g-b-d, with the added seventh becomes g-b-d-f and is labelled V7.
A seventh chord is a chord consisting of a triad plus a note forming an interval of a seventh above the chord's root. When not otherwise specified, a "seventh chord" usually means a dominant seventh chord. However, a variety of sevenths may be added to a variety of triads, resulting in many different types of seventh chord, as described below.
