The Sufis, who brought Islam to much of sub-Saharan Africa, dance, pray and preach using drama and humor.

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The Sufis, who took Islam to much of sub-Saharan Africa, dance, pray and preach using drama and humor.

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The missing ingredient turned out to be sub-bass: The lowest frequencies audible to the human ear, used extensively by dance acts to give their rhythm tracks an added wallop.

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