Harmony · Keys

Find the chords that belong together.

Choose a major or natural-minor key and see its seven diatonic triads, Roman numerals and chord tones.

KeyMode

Diatonic triadsC major

C · E · G

major

iiDm

D · F · A

minor

iiiEm

E · G · B

minor

IVF

F · A · C

major

G · B · D

major

viAm

A · C · E

minor

vii°Bdim

B · D · F

diminished

Use the degrees

Think in functions as well as names.

Roman numerals make a progression portable. I–V–vi–IV in C major is C–G–Am–F; the same degree pattern can be moved into another key without changing its harmonic shape.

Natural minor here stays intentionally simple. Harmonic minor and secondary dominants belong to a later harmony layer rather than being mixed into the basic key map.

Build and move the progression.

MapLive

Circle of fifths

See neighboring keys and relative minors.

Open →

TransposeLive

Chord transposer

Move your progression to a different pitch level.

Open →

ChordLive

Chord finder

Inspect the notes and formula inside an individual chord.

Open →

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