Critic Scott Cantrell assesses Andrew Litton’s tenure as director of the Dallas Symphony, and ponders what the orchestra might look for in his successor: “Mr. Litton certainly energized the DSO and raised its profile in the community. He took the orchestra on three European tours and conducted it in four concerts at New York’s Carnegie Hall. In an era when union contracts largely priced American orchestras out of the recording market, he and the DSO turned out an amazing 23 CDs. As time wore on, musicians, local cognoscenti and critics grumbled about a lack of depth.”