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5 progressions (circular I-IV-V, two-chord vamp, i-bVII minor vamp, No Woman No Cry I-V6-vi-IV, verified rocksteady I-ii-iii-ii) x 2 plays: top-3 skank triads, Wailers middle-string set, top-4 partials, quality-neutral 5+R dyads. One-drop/double-skank/ska/bubble grids documented. Research flags honoured (NWNC is major-key; Get Up Stand Up stored as near-one-chord; doo-wop claim replaced with verified Queen Majesty changes). Validator and build green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>