With Moscow-born Regina Spektor at the Fillmore this week and Tuvan throat singers at the Muse a few weeks back, you might think the president’s cozy friendship with Russia is sneaking its way into the arts. You’d be wrong. As a child, singer-songwriter Spektor’s family relocated to the U.S. under perestroika, when a great migration of Russian Jews fled the then-Soviet Union. She got her start on New York’s anti-folk scene, and is perhaps best-known for her song “Fidelity.”