What is the I–IV–I–I progression?
Simple two-chord blues vamp over four bars.
Songs that use this
- Got My Mojo Working
- Baby Please Don't Go
Why it works
These chords outline strong tonic, dominant, and relative minor colors in C major—easy to sing and easy to remember on ukulele.
Try in other keys
Same Roman numerals; chords transpose with the key.
C major → C-F-C-CD major → D-G-D-DE major → E-A-E-EF major → F-Bb-F-FG major → G-C-G-GA major → A-D-A-AB major → B-E-B-B