Answer: introits

AnswerCrossword Clue
INTROITSMass sections
INTROITSSome sung psalms
introitspart of a psalm with antiphon recited by the celebrant of the Mass at the foot of the altar and, at High Mass, sung by the choir when the priest begins the Mass
introitsINTROIT, psalm or antiphon sung or said at the start of a service
introitschoral response sung at the beginning of a religious service
introitspsalm or anthem sung as the celebrant of the Holy Communion enters the sanctuary