The evening begins with a CD release celebration of composer-saxophonist Patrick Zimmerli’s Clockworks, a musical meditation on time, in all its forms, performed by Zimmerli with former Bad Plus pianist Ethan Iverson, bassist Chris Tordini and composer-jazz drummer John Hollenbeck. In the evening’s second half, pop/art song composer-violinist-vocalist Carla Kihlstedt and composer Jeremy Flower join Zimmerli, Tordini and Hollenbeck for the world premiere of Songs of Mourning, an exploration of sorrow ranging from the political to the personal, and other works from their cumulative pasts.