Louis Armstrong defines swing

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Citing the book Scott Joplin and the Age of Ragtime by Ray Argyle (2009) p. 172, and two other sources, in its profile of Swing music Wikipedia says:

Louis Armstrong shared a different version of the history of swing during a nationwide broadcast of the Bing Crosby (radio) Show. ^[2] Crosby said, “We have as our guest the master of swing and I’m going to get him to tell you what swing music is.” Armstrong said,

Ah, swing, well, we used to call it syncopation—then they called it ragtime, then blues—then jazz. Now, it’s swing. White folks yo’all sho is a mess.^[3][4]