Michelle Obama Hosts Spouses Of World Leaders At Pittsburgh Summit

PITTSBURGH - SEPTEMBER 25: (L-R) Musician Yo-Yo Ma, singers Trisha Yearwood and Sara Bareilles answer questions during a performance watched by first lady Michelle Obama and the other spouses of the visiting G-20 leaders at the CAPA School on September 25, 2009 in Pittsburgh, Pennsylvania. U.S. President Barack Obama and heads of state from the world's leading economic powers are meeting for the second day of the G-20 summit, aimed at promoting economic growth.