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Harmonic Contexts

Now we’ll take a look at what happens when we put different roots underneath each quartal chord. While slash chords with triads are quite obvious, not every quartal chord/root combination results in a clear harmonic structure. Choose some combinations you find interesting and use them on suitable chord progressions. Again, take your time to allow the sounds to sink in.

Perfect Quartal Chord 4-4 (C-F-Bb)

Root Implied Chord Scale Degrees
C C7sus4 1 11 b7
Db Dbmaj13 7 3 13
D Dm7(b13) b7 b3 b13
Eb Eb6/9
Ebm6/9
13 9 5
E E7alt b13 b9 #11
F Fsus4 5 1 11
Gb Gbmaj7(#11) #11 7 3
G Gm11 11 b7 b3
Ab Ab6/9 3 13 9
A A7alt
Am7(b9/b13)
b3 b13 b9
Bb Bbmaj9
Bb9
Bb9sus4
Bbm9
9 5 1
B Bmaj7(b9/#11)? b9 #11 7

Perfect-Augmented Quartal Chord 4-#4 (C-F-B)

Root Implied Chord Scale Degrees
C Cmaj7(add4)
Cm(maj7/11)
1 11 7
Db ? 7 3 b7
D Dm13 b7 b3 13
Eb Ebmaj13(#5) 13 9 #5
E E7(b9/b13) b13 b9 5
F Fmaj7(#11) 5 1 #11
Gb ? #11 7 11
G G7(add4) 11 b7 3
Ab Ab7(b9/13) 3 13 b3
A Am9(b13) b3 b13 9
Bb ? 9 5 b9
B B7alt b9 #11 1

Augmented-Perfect Quartal Chord #4-4 (C-F#-B)

Root Implied Chord Scale Degrees
C Cmaj7(#11) 1 #11 7
Db ? 7 11 b7
D D13 b7 3 13
D# B7(b9)/D# b9 5 1
E E9(b13) b13 9 5
F F7(b9/13) 5 b9 #11
Gb Gbm7(b5) b5 1 11
G Gmaj7(add11) 11 7 3
Ab Ab7(#9) 3 b7 b3
A Am6/9 b3 13 9
Bb ? 9 b13 b9
B Bmaj7(b9) b9 5 1

Augmented-Diminished Quartal Chord #4-b4 (C-F#-Bb)

Root Implied Chord Scale Degrees
C C7#11 1 #11 b7
Db Dbmaj7(add11) 7 11 13
D D7(b13) b7 3 b13
Eb Ebm6 13 b3 5
E E7(9/b13)
E7(#5)
b13 9 #11
F Fsus4(b9)
Fm11(b9)
5 b9 11
Gb Gbmaj7(#11)
Gb7(#11)
#11 1 3
G Gm/maj7(11) 11 7 b3
Ab Ab7 3 b7 9
A A7(b9/13)
Am7(b9/13)
b3 13 b9
Bb Bb9(#5)
Bbmaj9(#5)
Bbm9(b13)
9 b13 1
B B7(b9) b9 5 7

Diminished-Augmented Quartal Chord b4-#4 (C-E-Bb)

Root Implied Chord Scale Degrees
C C7 1 3 b7
Db Dbm(maj7) 7 b3 13
D Dm9(b13)
D9(b13)
b7 9 b13
Eb Eb7(b9/13) 13 b9 5
E E7alt b13 1 #11
F Fmaj7(add11) 5 7 11
Gb Gb7(#11) #11 b7 3
G Gm7(11/13) 11 13 b3
Ab Abmaj9(#5)
Ab9(#5)
Abm9(b13)
3 b13 9
A Am7(b9) b3 5 b9
Bb Bbmaj9(#11)
Bb9(#11)
9 #11 1
B Bmaj7(b9/11)? b9 11 7