The Madrigal Choir of Binghamton just offered its 32d season of “Lessons and Carols for Christmas.” This is both a concert and a worship service, the sacred and secular readings and classical and contemporary anthems and familiar Christmas carols recounting the story of the coming of Messiah. Sitting in the choir looking out over the audience, one can see family, friends and neighbors. Some have come for the enjoyment of the music, others as an act of seasonal devotion, from within this parish or some other across town. For still others, this is the closest they will ever come to being churchgoers. For all these groups, and particularly the last described, Artistic Director Anne Boyer Cotten says it’s not just about how well we sing the music but about how well we tell the story.