Cellist Alban Gerhardt was having one of those days. Right before a live radio broadcast, he broke a string on his cello. He made a quick exit from the stage to get another string, only to find the door locked. Then he ran back across the stage to a different door. He later observed in his blog that his mad dashing about must have looked cartoonish, like the roadrunner. We'll hear Gerhardt on a calmer day, performing the Dvorak Cello Concerto with the Philadelphia Orchestra.