(Credit: © Cordula Treml) “An Anatomy of Melancholy” is a new 75-minute show from countertenor Iestyn Davies and lutenist Thomas Dunford, designed and directed by Netia Jones. Its title comes from Robert Burton’s famous seventeenth-century treatise on the various varieties of despair and mania that make up what now wears the guise of depression and anxiety.  The musical thread connecting {…}