For years musicians and critics have made statements about the nature of swing in jazz in general and the playing of Louis Armstrong in particular, based on the evidence of their ears. In order to quantify these issues, precise timing analyses of two mid-tempo solos by Louis Armstrong were analyzed, focusing in particular on stop-time sections. Two key elements of swing were analyzed; placement of the downbeats, and the swing or triplet ratio. For these solos, Armstrong played fairly close to on the beat, with a swing ratio of about 1.6 to 1.

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