In the first hour of this broadcast, a tribute to composer, conductor, writer and pianist Pierre Boulez. Boulez died Jan. 5, 2016, at the age of 90. In the second hour, a conversation with Andrew Appel, harpsichordist and director of the Four Nations Ensemble, about the group's upcoming series of concerts at the Sterling and Francine Clark Art Institute in Williamstown, Mass. Hosted by Sheri Bauer-Mayorga.