“Five in Istanbul,” an exhibition this month at the stately Borunsan Müzik Evi arts space establishes Istanbul as a rising star on the contemporary art scene. The show, from New York’s Lehmann Maupin Gallery pits the works of the gallery’s lovelorn romantics-Tracey Emin’s saucy neon declarations, Hernan Bas’s expressionistic paintings of male nymphets-against its multimedia poets: Teresita Fernandez’s whispery glass cubes, Tony Oursler’s talking terrariums, and Jennifer Steinkamp’s video installation of a walled garden (90-212-336-3280)