Progressions in Eb — Puerto Rican Cuatro (Antiguo A-D-G-C-F)

Eb major harmonises to Eb – Fm – Gm – Ab – Bb – Cm – D°; D# minor to D#m – E#° – F# – G#m – A#m – B – C#. Each chord links to its Puerto Rican Cuatro (Antiguo A-D-G-C-F) grips, so a whole key becomes a short list of hand positions.

Most of this repertoire lives on three or four of these chords, and the interesting work is in what happens between them: the pick states a line, the grip lands underneath it, and the next change arrives before the ear has finished the last one.