Rehearsing at his home, the singers can hear each other in fine detail and concentrate on pronouncing words the same way at the same time.
"To have four guys who have very different instruments ? you know, alto, tenor, baritone and bass ? coming together and sounding as uniform as a string quartet, we have to work quite hard on uniformity of vowels," countertenor Geoffrey Silver says.
You can watch the group sing through Lasso's "Matona mia cara," in which a German soldier woos a maiden, above. And to watch New York Polyphony sing more and talk about rehearsing, check out our new series In Practice.