Ref: Diatonic Keys for Triads

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This page shows which major, minor, and harmonic minor keys a particular triad is diatonic to. Find the chord that you want to know which keys it belongs to in the left-most column, then look for the x's on that row for all the keys.

	Major
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
A	I					IV		V
Am				vi					ii		iii
A+
A°		x
A♯		I					IV		V
A♯m					vi					ii		iii
A♯+
A♯°			x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
B			I					IV		V
Bm	iii					vi					ii
B+
B°				x
C				I					IV		V
Cm		iii					vi					ii
C+
C°					x
C♯					I					IV		V
C♯m	ii		iii					vi
C♯+
C♯°						x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
D	V					I					IV
Dm		ii		iii					vi
D+
D°							x
D♯		V					I					IV
D♯m			ii		iii					vi
D♯+
D♯°								x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
E	IV		V					I
Em				ii		iii					vi
E+
E°									x
F		IV		V					I
Fm					ii		iii					vi
F+
F°										x
F♯			IV		V					I
F♯m	vi					ii		iii
F♯+
F♯°											x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
G				IV		V					I
Gm		vi					ii		iii
G+
G°												x
G♯					IV		V					I
G♯m			vi					ii		iii
G♯+
G♯°	x

	Minor
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
A			x		x				x
Am	x					x		x
A+
A°										x
A♯				x		x				x
A♯m		x					x		x
A♯+
A♯°											x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
B					x		x				x
Bm			x					x	x
B+
B°
C	x					x		x
Cm				x					x	x
C+
C°		x
C♯		x					x		x
C♯m					x				x		x
C♯+
C♯°			x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
D			x					x		x
Dm	x					x				x
D+
D°				x
D♯				x					x		x
D♯m		x					x				x
D♯+
D♯°					x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
E					x					x		x
Em	x		x					x
E+
E°						x
F	x					x				x
Fm		x		x					x
F+
F°							x
F♯		x					x				x
F♯m			x		x				x
F♯+
F♯°								x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
G	x		x					x
Gm				x		x				x
G+
G°									x
G♯		x		x					x
G♯m					x		x				x
G♯+
G♯°									x

	Harmonic Minor
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
A					x	x
Am	x							x
A+										x
A°		x									x
A♯						x	x
A♯m		x							x
A♯+											x
A♯°			x									x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
B							x	x
Bm			x							x
B+												x
B°	x			x
C								x	x
Cm				x							x
C+	x
C°		x			x
C♯									x	x
C♯m					x							x
C♯+		x
C♯°			x			x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
D										x	x
Dm	x					x
D+			x
D°				x			x
D♯											x	x
D♯m		x					x
D♯+				x
D♯°					x			x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
E	x											x
Em			x					x
E+					x
E°						x			x
F	x	x
Fm				x					x
F+						x
F°							x			x
F♯		x	x
F♯m					x					x
F♯+							x
F♯°								x			x
Key/ Chord	A	A♯	B	C	C♯	D	D♯	E	F	F♯	G	G♯
G			x	x
Gm						x					x
G+								x
G°									x			x
G♯				x	x
G♯m							x					x
G♯+									x
G♯°	x									x

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Intervals Scales Circle of 5ths Fret Maps CAGED Charts Diatonic Chords Diatonic Keys Chord Fingerings Chord Naming Progressions Modes Counting Rhythm Arpeggios Reading Tab Other Notation Injury