The monks sing the seqeuence of the Dies Irae, which is traditionally said or sung for a Requiem Mass between the Epistle and gradual and before the reading of the Holy Gospel in the Traditional Catholic Mass of all ages. This beautiful sequence was removed from the Requiem Mass after the disaster which was Vatican II 1962 - 1964. This was removed from the novus ordo "mess" as it was deemed to depressing for the mourners to listen to the truth of final judgement as is taught in Traditional Catholic Churches especially the FSSPX.
