a. Unidentified Guinean musician (percussion), “Fête des Échassiers Guerzé.” The syncopated eighth-note/sixteenth-note pattern turns into triplet subdivisions. (Two-four meter was chosen for clarity of display; there is no evidence that the music is in this meter.) Source: Musicians of Guinea, Guinée: Récits et Epopées, Ocora C 560009.

b. Robert Johnson (guitar), “Ramblin’ On My Mind (alternate take).” The long-short triplet pattern turns into eighth-note subdivisions. Source: Robert Johnson, The Complete Recordings, Columbia C2K 46222.