On August 11, 2001, Drum Corps International held its annual World Championship in Buffalo, N.Y. On that summer night, as was their tradition, corps members played a medley of "America the Beautiful" and "O Canada." Who could know that exactly one month later, the world would be changed forever? On the 11th anniversary of the tragic events of September 11, 2001, we look back at this video that pays tribute to those who lost their lives and to the heroes who saved so many others.