"I like to play the drums," the priest told them. "If you want, I can-"
"No, no drums!" Book headed him off. The shepherd turned to the crew he'd brought into the abbey and explained: "The brothers can't afford bells, so they use drums to announce services. The blessed father gets a little...over-enthusiastic."
A monk ran up and whispered in the father's ear. The priest beamed happily. "If you'll excuse me, Shepherd. It's time to drum vespers."
Book and the crew clapped their hands over their ears just before the drums began to thunder so hard the foundations shook.