Swarthmore College undergraduates coached by members of the faculty have been rehearsing and will soon perform three concerts in the fall 2019 Elizabeth Pollard Fetter chamber music series. The first concert in the series will take place on Saturday, November 16, 8 p.m. at Lang Concert Hall. “Critical Mass,” an ensemble of seven students coached by James Blasina will undertake works by de Machaut, Monteverde, des Prez, and Byrd.