The I-III+-vi-V progression I-III+-vi-V
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.
III+Eaug
The augmented mediant — the III triad with a raised 5th, a restless, suspended colour that blurs any centre through its symmetry.
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.
VG7
Tension pulling home — the chord that 'wants to resolve' to I; it closes or opens sections. The dominant, the engine of the key.