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British singer Amy Winehouse performing in 2008

A post mortem is being carried out today to determine what caused the death of British singer, Amy Winehouse. She died on Saturday at the age of 27. Hailed as a musical genius, Winehouse's battle with drug and alcohol addiction often made the headlines more than her work. NPR Music Critic Ann Powers met and interviewed Amy Winehouse back in 2007 and shares her memories of the troubled musician.