The Dahlia Flute Duo—Mary Matthews (MM ’10, Flute) and Melissa Wertheimer (MM ’10, Piccolo)—will perform at the 2011 Congress of the International Alliance for Women in Music, held in Flagstaff, Ariz, on Sept. 16. They will give the world premiere of Chatter by Nicole Chamberlain and perform An Unsubstantial Territory by Linda Dusman.