Musicianstool — Verified Music Theory & Audio DSP Algorithms

Emre Özaydın

Master Chord Dictionary & Formulas

Musical Chords Library & Chart

Browse essential chord structures, intervals, and harmonic notes across all 12 chromatic pitches. Click any chord or root note to explore interactive piano voicings and theory breakdowns.

Musical Definition & Chord Construction Facts

In Western equal temperament, a chord is formed by stacking harmonic intervals above a root note. Major triads require a major 3rd (4 semitones) and perfect 5th (7 semitones). Minor triads lower the third by 1 semitone (3 semitones). Seventh chords add a fourth pitch at either 10 semitones (minor 7th) or 11 semitones (major 7th).

Browse by Root Note

C C#Db D D#Eb E F F#Gb G G#Ab A A#Bb B

Full 12-Tone Chord Directory

84 Triads & 7th Chords

Root	Major	Minor	Dominant 7th	Major 7th	Minor 7th	Diminished	Augmented
C	CC-E-G	CmC-D#-G	Cmaj7C-E-G-B	Cm7C-D#-G-A#	C7C-E-G-A#	CdimC-D#-F#	CaugC-E-G#
C# (Db)	C#C#-F-G#	C#mC#-E-G#	C#maj7C#-F-G#-C	C#m7C#-E-G#-B	C#7C#-F-G#-B	C#dimC#-E-G	C#augC#-F-A
D	DD-F#-A	DmD-F-A	Dmaj7D-F#-A-C#	Dm7D-F-A-C	D7D-F#-A-C	DdimD-F-G#	DaugD-F#-A#
D# (Eb)	D#D#-G-A#	D#mD#-F#-A#	D#maj7D#-G-A#-D	D#m7D#-F#-A#-C#	D#7D#-G-A#-C#	D#dimD#-F#-A	D#augD#-G-B
E	EE-G#-B	EmE-G-B	Emaj7E-G#-B-D#	Em7E-G-B-D	E7E-G#-B-D	EdimE-G-A#	EaugE-G#-C
F	FF-A-C	FmF-G#-C	Fmaj7F-A-C-E	Fm7F-G#-C-D#	F7F-A-C-D#	FdimF-G#-B	FaugF-A-C#
F# (Gb)	F#F#-A#-C#	F#mF#-A-C#	F#maj7F#-A#-C#-F	F#m7F#-A-C#-E	F#7F#-A#-C#-E	F#dimF#-A-C	F#augF#-A#-D
G	GG-B-D	GmG-A#-D	Gmaj7G-B-D-F#	Gm7G-A#-D-F	G7G-B-D-F	GdimG-A#-C#	GaugG-B-D#
G# (Ab)	G#G#-C-D#	G#mG#-B-D#	G#maj7G#-C-D#-G	G#m7G#-B-D#-F#	G#7G#-C-D#-F#	G#dimG#-B-D	G#augG#-C-E
A	AA-C#-E	AmA-C-E	Amaj7A-C#-E-G#	Am7A-C-E-G	A7A-C#-E-G	AdimA-C-D#	AaugA-C#-F
A# (Bb)	A#A#-D-F	A#mA#-C#-F	A#maj7A#-D-F-A	A#m7A#-C#-F-G#	A#7A#-D-F-G#	A#dimA#-C#-E	A#augA#-D-F#
B	BB-D#-F#	BmB-D-F#	Bmaj7B-D#-F#-A#	Bm7B-D-F#-A	B7B-D#-F#-A	BdimB-D-F	BaugB-D#-G

Chord Formulas & Musical Character

0 - 4 - 7 st3 Notes

Major Chord

Happy, bright, and stable. The most fundamental chord in music.

Usage: Use as the foundation of your song, resolving point (tonic).

0 - 3 - 7 st3 Notes

Minor Chord

Sad, melancholic, and serious. The darker counterpart to the major chord.

Usage: Use to convey sadness, tension, or deep emotion.

0 - 4 - 7 - 11 st4 Notes

Major 7th Chord

Dreamy, romantic, and sophisticated. Adds a jazzy, smooth color.

Usage: Replace standard major chords for a softer, more emotional feel.

0 - 3 - 7 - 10 st4 Notes

Minor 7th Chord

Smooth, cool, and slightly melancholic without being overly sad.

Usage: Great for groovy, atmospheric, or chill tracks.

0 - 4 - 7 - 10 st4 Notes

Dominant 7th Chord

Tense, bluesy, and commanding. Wants to resolve to the tonic.

Usage: Use as the V chord to create a strong pull back to your I chord.

0 - 3 - 6 st3 Notes

Diminished Chord

Tense, creepy, and highly unstable.

Usage: Use as a passing chord to build extreme tension before resolving.

0 - 4 - 8 st3 Notes

Augmented Chord

Dreamy, mysterious, and unresolved.

Usage: Use as a transition or turnaround chord for a 'floating' feeling.

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