The "" has been used in the Roman liturgy as the sequence for the Requiem Mass for centuries, as made evident by the important place it holds in musical settings such as those by Mozart and Verdi. It appears in the Roman Missal of 1962, the last edition before the implementation of the revisions that occurred after the Second Vatican Council. As such, it is still heard in churches where the Tridentine Latin liturgy is celebrated. It also formed part of the traditional liturgy of All Souls' Day.