C major
C · E · G
Harmony tool
Chords in a Key Explorer
Generate diatonic triads with Roman numerals and correctly spelled notes.
D minor
D · F · A
E minor
E · G · B
F major
F · A · C
G major
G · B · D
A minor
A · C · E
B diminished
B · D · F
These are neutral theoretical relationships generated from the selected scale. No sequence is associated with a named song.
Chords in a Key Explorer
Diatonic chords are built by stacking alternate notes from the selected scale and labelling their relationships with Roman numerals.
In C major the sequence is C, Dm, Em, F, G, Am and B diminished: I–ii–iii–IV–V–vi–vii°.
Read the result
The text answer, formula and labelled visual are equivalent views of the selected state. A diatonic chart describes available structures; it does not claim that every piece stays inside one key.
Connected theory
Follow the selected root or tonic into its hub, then into the relevant key, interval or inversion reference. Contextual links use the active subject rather than the same generic list on every page.
Try a controlled comparison
Change one selector at a time and describe what changed in the notes, degrees, bass or signature. Generated audio is optional and user initiated.
- Keep the root fixed and change quality.
- Keep the structure fixed and transpose.
- Compare the visible text with the keyboard.
Keep exploring
Use the related links to compare the answer with another tool or read the musical idea in more detail.