Nearly four years ago, when Barbra Streisand last played Chicago's United Center, she duetted with three teenage tenors, a saxophonist and her son, Jason Gould. Turns out, Streisand doesn't need any help to captivate a crowd, which she did Tuesday as part of "Barbra: The Music ... The Mem'ries ... The Magic," her nine-city tour that launched earlier this month in Los Angeles.