Joan Fearnley and Catherine Clase update advice to choir directors on singers' masks

In December 2020, Joan Fearnley along with Charles de Lannoy and Catherine Clase from the McMaster Centre of Excellence in Protective Equipment and Materials conducted a webinar for Choral Canada explaining the science of masks for choral directors and makers of singers' masks. Joan and Catherine update that advice on the Choral Canada Blog: Update Masks for Choirs - CHORAL CANADA