Sunday conversation: Itzhak Perlman talks about the art of listening, YouTube and his friend President Obama

It's the middle of Hanukkah when we talk, but beloved violinist and music icon Itzhak Perlman is working. Speaking by phone from his New York City home, the Israeli-born star is about to leave for the 2½-week winter residency at the Perlman Music Program in Sarasota, Fla. Then he'll head to Los...