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

Ab major harmonises to Ab – Bbm – Cm – Db – Eb – Fm – G°; G# minor to G#m – A#° – B – C#m – D#m – E – F#. 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.