Seventh chords consist of four notes from the major scale: root, third, fifth, and seventh (1–3–5–7). The breakdown for each chord type is:

• Major 7th: The major 7th chord consists of a major triad with an added major 7th interval. The formula is: root, major 3rd, perfect 5th, major 7th, or 1–3–5–7.

• Dominant 7th: The dominant 7th chord -consists of a major triad with an added minor 7th interval. The formula is: root, major 3rd, perfect 5th, minor 7th. or 1–3–5-b7.

• Minor 7th: The minor 7th chord consists of a minor triad with an added minor 7th interval. The formula is: root, minor 3rd, perfect 5th, minor 7th, or 1-b3–5-b7.

Major 7th Chord Shapes

The below figure shows the Cmaj7 chords for patterns 1, 2, and 4.

Dominant 7th chord shapes

This figure shows the C7 chords in patterns 1, 2. and 4, plus an alternate pattern 4 shape.

Minor 7th Chord Shapes

This figure shows the Cm7 chords in patterns 1,2, and 4, plus an alternate pattern 2 fingering.