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Chord Tonality - 7th Chords

Seventh chords are four-tone chords consisting of the intervals of a third, a fifth, and a seventh above a root.  Thus, a seventh chord is a basic triad plus the interval of a third or a root, third,fifth, and a seventh, where the seventh is  of several different kinds as shown in Table 1:


Table 1 - Types of Seventh Chords

Major triad + m3

Major triad + M3

Minor triad +m3

Dominant seventh

Major seventh

Minor seventh

C7

CM7

Cm7

 The guitar chord diagrams for the open dominant seventh chords is shown below: