Despite a break from performance during World War II during which Babin served in the Armed Forces .
Babin worked with war casualties in Washington , D.C. hospitals , the duo still managed to perform over 1,200 concerts in North America alone .
Despite a break from performance during World War II during which Babin served in the Armed Forces and Vronsky worked with war casualties in Washington , D.C. hospitals , the duo still managed to perform over 1,200 concerts in North America alone .