David Finckel and Wu Han, the new co-directors of the Chamber Music Society of Lincoln Center, could be said to be the poster children for 21st-century musical multitasking. The two are chamber music’s power couple of the moment, with Mr. Finckel best known as the cellist of the Emerson Quartet. They run their own internet-based record label, founded a stunningly successful chamber music festival in California last year, and each maintain a full performance schedule. Unusual? Sure. But in these days when classical music is increasingly serving a niche market, it takes that kind of dedication and willingness to diversify to succeed.