A woman soldier sings among pro-democracy protesters occupying Beijing's Tiananmen Square, about June 2, 1989. Police and military would occasionally mix with protesters in an attempt to keep the demonstration peaceful. In the early morning hours of June 4, 1989, soldiers overran the square, leaving hundreds dead overnight. (AP Photo/Jeff Widener)

A woman soldier sings among pro-democracy protesters occupying Beijing's Tiananmen Square, about June 2, 1989. Police and military would occasionally mix with protesters in an attempt to keep the demonstration peaceful. In the early morning hours of June 4, 1989, soldiers overran the square, leaving hundreds dead overnight. (AP Photo/Jeff Widener)