Nashville Number System

Key Explorer

Select a key to see its full chord map — Nashville numbers, chord names, qualities, and common variations.

G Major·G · A · B · C · D · E · F#
1I
G
G·B·D
Major Tonic
2ii
Am
A·C·E
Minor Supertonic
3iii
Bm
B·D·F#
Minor Mediant
4IV
C
C·E·G
Major Subdominant
Cadd9
5V
D
D·F#·A
Major Dominant
D7Dsus2Dsus4
6vi
Em
E·G·B
Minor Submediant
7vii°
F#dim
F#·A·C
Diminished Leading tone
Tonic (I)
Major
Minor
Diminished

Harmonic Map

Circle of Fifths

Explore how keys relate. Click any segment to retune the whole page — the chord map, relationships, key signature and fretboard all follow.

0AmC1♯EmG2♯BmD3♯F#mA4♯C#mE5♯G#mB6♯/6♭EbmGb5♭BbmDb4♭FmAb3♭CmEb2♭GmBb1♭DmF
Grel. Em1 sharp

Circle of Fifths — ascending by perfect fifths (C → G → D → A…)

Selected key G major

Key Relationships — G Major

Relative Minor

Em

Parallel Minor

Gm

Dominant (V)

Subdominant (IV)

Common Modulation Targets

Key Signature

𝄞♯

G major·1 sharp · F♯

Chord Progression Builder

Presets

Diatonic chords — tap to add

Progression (0/8)

Add chords from above or pick a preset to build a progression.

Scale on the Fretboard — G Major

123456789101112EF#GABCDEBCDEF#GABGABCDEF#GDEF#GABCDABCDEF#GAEF#GABCDE
Root Scale note Standard tuning · tap a note to hear it