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SOKOTO, NIGERIA: A drummer sings to the audience 20 June 2004 at the Shehu Kangiwa Square during a durbar to commemorate the bicentenary of the Sokoto Caliphate in northwestern Nigeria. AFP PHOTO/PIUS UTOMI EKPEI (Photo credit should read PIUS UTOMI EKPEI/AFP via Getty Images)

SOKOTO, NIGERIA:  A drummer sings to the audience 20 June 2004 at the Shehu Kangiwa Square during a durbar to commemorate the bicentenary of the Sokoto Caliphate in northwestern Nigeria. AFP PHOTO/PIUS UTOMI EKPEI  (Photo credit should read PIUS UTOMI EKPEI/AFP via Getty Images)