….the clergy are told to prepare each household for the devotional activities devised for the extraordinary circumstances by teaching them a variety of prayers, litanies, and Psalms ahead of the quarantine. During the quarantine, bells across the parish were to be rung seven times a day, approximately every two hours, to call the households to prayer. Once begun, the bell would be rung again every quarter hour, until the fourth bell signals an end to the hour of prayer. While the bell rings,
litanies or supplications will be chanted or recited at the direction of the Bishop. This will be performed in such a way that one group sings from the windows or the doors of their homes, and then another group sings and responds in turn.
To ensure that these prayers are carried out properly, the decree continues, a member of the clergy or someone trained in these prayers (possibly the head of the household) should also come to a window or door at the appointed times to direct the prayers and stir up enthusiasm for this devotion. To further facilitate these devotional activities, Borromeo instructed the parish clergy to be supplied with books ‘that contain certain prayers, litanies, and oration, which will be made freely available, in order that he may go and distribute them to his own or other parishes’.
… Borromeo’s directive to sing at doors and windows was evidently put into practice and impressed a number of chroniclers. In his Relatione verissima, Paolo Bisciola reports:
[W]hen the plague began to grow, this practice [of singing the litanies in public] was interrupted, so as not to allow the congregations to provide it more fuel. The orations did not stop, however, because each person stood in his house at the window or door and made them from there […] Just think, in walking around Milan, one heard nothing but song, veneration of God, and supplication to the saints, such that one almost wished for these tribulations to last longer.
