The I-I+-IV-vi progression I-I+-IV-vi
Level: AdvancedMode: major
Piano sound loads on first tap. Resolved in the key of C — every chord links to its full analysis.
What each degree does
ICmaj
Feels like home — complete rest, where the piece departs from and returns to. The major tonic, where everything settles.
I+Caug
The augmented tonic — the 5th is raised, creating an inner voice that climbs chromatically. Home set in a bright tension on the way back to stability.
IVFmaj
A step out from home into the light — the subdominant. It sets up the dominant or resolves with a plagal ('amen') colour, opening space without sharp tension.
viAm
The relative minor — the tonic's reflective shadow. It often replaces I in a deceptive cadence, where you expected home and its sad side arrives instead.