When Wu Han and David Finckel took over the Chamber Music Society of Lincoln Center, they faced a programming challenge. The Society has traditionally performed all of the Brandenburg Concertos on a single program each year. But should the tradition continue? “Half of the board members told me, ‘If you cancel the “Brandenburgs,” I’m not supporting you.’ The other half said, ‘If I hear another six “Brandenburg” concertos, I’m going to go crazy’.”