Moments before Ms. Lauryn Hill hopped on a call with The Associated Press, she and Fugees' bandmate Wyclef Jean stood in the center of London's Piccadilly Circus, surrounded by fans. Broadcast above them, on the bright LED screen of Piccadilly Lights, was a short film curated by Hill and created by Los Angeles artist Lauren Halsey: an animated, colorful collage depicting the heroes and symbols of the global African diaspora. The message was clear: This is a a celebration of community, culture,...