This is known more commonly as the 13th chord, with both the dominant 7th and the 6th (or 13th). The chord therefore contains the 5, 6, 7, & 8 (root), which can be spread or clustered. Playing the 13th note extension (or 6th) without the dominant 7th is known as an Add 6 (+6) chord.
Six seven chord table
Chord
Root
Major third
Perfect fifth
Major sixth
Minor seventh
C7/6
C
E
G
A
B♭
C♯7/6
C♯
E♯ (F)
G♯
A♯
B
D♭7/6
D♭
F
A♭
B♭
C♭
D7/6
D
F♯
A
B
C
D♯7/6
D♯
F (G)
A♯
B♯ (C)
C♯
E♭7/6
E♭
G
B♭
C
D♭
E7/6
E
G♯
B
C♯
D
F7/6
F
A
C
D
E♭
F♯7/6
F♯
A♯
C♯
D♯
E
G♭7/6
G♭
B♭
D♭
E♭
F♭ (E)
G7/6
G
B
D
E
F
G♯7/6
G♯
B♯ (C)
D♯
E♯ (F)
F♯ (G♭)
A♭7/6
A♭
C
E♭
F
G♭
A7/6
A
C♯
E
F♯
G
A♯7/6
A♯
C (D)
E♯ (F)
F (G)
G♯
B♭7/6
B♭
D
F
G
A♭
B7/6
B
D♯
F♯
G♯
A
References
^François-Joseph Fétis, Mary I. Arlin (1994). Esquisse de l'histoire de l'harmonie, p.130. ISBN 978-0-945193-51-7.
^Kroepel, Bob (1993). Deluxe Encyclopedia of Piano Chords, p.19. ISBN 978-0-87166-579-9.
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