Debbie Harry, Fab 5 Freddy, Grandmaster Flash, Tracy Wormworth, and Chris Stein laughing together on a fenced blacktop. Joey Ramone wearing shades on St. Mark’s. Run DMC and Posse striking poses in Hollis, Queens. A blur of Talking Heads. LL Cool J looking coolly into the camera, a stereo hoisted on his shoulder. From punk to pop to hip-hop to jazz, this exhibition, coinciding with the 40th anniversary of MTV, offers a rhythmic, captivating portrait of 1980s New York. —J.V.