Husband-and-wife musicians David Finckel, cellist of the Emerson String Quartet, and Wu Han, the pianist who used to run the La Jolla Festival, have been named the new artistic directors of the Chamber Music Society of Lincoln Center. Finckel and Han are also the co-directors of the new California summer festival Music@Menlo. The pair replace clarinetist David Shifrin at the helm of CSM.