(Credit: Ensemble Altera official website) Ensemble Altera, the Providence-based classical choral group, will hold a concert entitled “We Watch and Welcome, Feminine Voices at Christmas.” The program for the concert will include Britten’s “Ceremony of Carols” and works by several female composers, including pieces by medieval mystic Hildegard von Bingen, 17th century composer Barbara Strozzi, and Joanna Marsh. “During the {…}