This summer while cantoring during Mass, Margaret Hillman was overcome by traumatic flashbacks that caused her to have panic attacks while singing music by Catholic composer David Haas.

Catholic composer David Haas is shown in a concert at the Ateneo de Manila University in Quezon City, Philippines, in this 2016 photo. (CNS/Titopao, CC BY-SA 4.0) However, as a fellow music ...