In 1973, in the rec room of a Bronx apartment building, Clive Campbell—stage name: DJ Kool Herc—and his sister, Cindy, put on a “Back to School Jam” party. Hip-hop was invented then and there, at 1520 Sedgwick Avenue. That year, every crumbling street corner in the Bronx sprang alive with “Masters of Ceremony” (or “M.C.s”) and nascent D.J.s, who remixed dated disco records. In 1979, “Rapper’s Delight,” by the Sugarhill Gang, hit the Billboard Hot 100 chart. Over the next 10 years, the obscure musical genre began its climb into the mainstream. This show celebrates the movement’s influence on music, the visual arts, fashion, and technology. Works by Hank Willis Thomas, Hassan Hajjaj, Nina Chanel Abney, and many others are part of the show. —Elena Clavarino