On the afternoon of April 5, after giving three lessons at his alma mater, Kenton Ridge High School, 22-year-old Eric Barga drove to Covenant Presbyterian Church for practices of the bell choir and arrived half an hour early, at about 6 p.m. Although the temperature was in the mid-50s, after years spent in claustrophobic practice rooms while working toward his degree from the exclusive New England Conservatory in Boston, Barga pulled the custom-made Fox 610 red maple bassoon out of its case, sat on the trunk of his car in the refreshing air and began playing scales. “There was a...