| Summary: | We examine the temporal properties of cyclical drumming patterns in an expert performance of Afro-Cuban rumba recorded in Santiago de Cuba. Quantitative analysis of over 9,000 percussion onsets collected from custom sensors placed on various instruments reveals different types and degrees of rhythmic variation across repetitions of each of five characteristic guaguancó patterns (clave, cascara, quinto, segundo, and tumba). We assess each instrument’s variability using principal component analysis and multidimensional scaling, complementing our quantitative exploration with insights from music theory. Through these methods, we uncover details of timing that are insufficiently conveyed with standard music notation in order to shed light on the role of improvised variation in solo and accompaniment ensemble roles.
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