C major
C · E · G
Harmony tool
Piano Chord Progressions
Explore neutral theoretical progressions such as I–IV–V–I and ii–V–I.
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.
Piano Chord Progressions
Choose a key and map Roman-numeral structures to correctly spelled chord tones. Playback uses generated chord tones only.
A ii–V–I in C major maps to D minor, G major and C major.
Read the result
The text answer, formula and labelled visual are equivalent views of the selected state. Roman numerals describe relationships, not ownership by any song; this site does not associate sequences with copyrighted works.
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.