PARK CITY, Utah (AP) — A convenient truth greeted John Legend when the singer contacted documentary director Davis Guggenheim about collaborating on a film to examine the nation’s public-school system.

Legend had been working with the hip-hop group the Roots on an album exploring 1960s and ’70s music, which led to a discussion about the civil-rights movement and then education, which he considers the civil-rights issue of our time.

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