Since recording in the 1970s and '80s, Nigerian William Onyeabor has dropped off the music map. Courtesy of the artist hide caption

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Violinist Isabelle Faust. Courtesy of the artist hide caption

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Who Is William Onyeabor? is being released by the Luaka Bop record label. It comes out Oct. 29. Courtesy of the artist hide caption

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Clockwise from upper left: Anna Calvi, M.I.A., Poliça, members of Los Campesinos!, Deltron 3030 and Phil Elverum of Mount Eerie Courtesy of the artists hide caption

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