After 31 years, 21 albums recorded for the ECM label alone and a demanding tour schedule of more than 100 concerts around the world each year, how does the U.K.-based Hilliard Ensemble keep things fre

After 31 years, 21 albums recorded for the ECM label alone and a demanding tour schedule of more than 100 concerts around the world each year, how does the U.K.-based Hilliard Ensemble keep things fresh? Read Anastasia Tsioulcas' column.