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It was a shocker in an age of shocking stories. Fifty-five members of the Skagit Valley Chorale in Mount Vernon, Washington, met at the local Presbyterian church on March 10 for a rehearsal. Three weeks later, 45 had tested positive for COVID-19. Two were dead. Despite the availability at the door of hand sanitizer and a general moratorium on handshaking and other forms of physical contact. Despite the testimony of several members that no one was heard to cough during the two-and-a-half-hour rehearsal. Nor is the Skagit Vallet story the only documented case of choral super-spreading. The Amsterdams Gemengd Koor (Amsterdam Mixed Choir)…