“Simple City” is the name locals gave to Benning Terrace, a housing project in southeast D.C. shouted out by local go-go artists and once recognized as one of the most active sites of gang violence in the country. Growing up a half-mile over the Maryland border, rapper IDK became childhood friends with a boy from the projects, and as his rap career opened up a world of new possibilities to him, he also sought to open doors for his friend. His latest project, a joint EP with DJ/producer Kaytranada, pays homage to the D.C. neighborhood and shows that life there is anything but Simple. The music video for “Taco”—the debut single off the EP—is set in Simple City and shot almost entirely in black-and-white. IDK’s outfit only adds to the contrast of the video. Looking like he didn’t change after...