Watch Obama sing the blues

Obama, who impressed Americans last month when he sang just one line of Al Green's "Let's Stay Together," topped that routine by singing several lines of blues standard "Sweet Home Chicago." The president was urged by blues great Buddy Guy at a White House reception Tuesday evening to sing along: "I heard you sing at Al Green, so you started something, you gotta keep it up now. You can do it." Obama hesitated at first, before taking the mic.