Lauds are a canonical hour of the Divine office. In the Roman Rite Liturgy of the Hours it is one of the major hours, usually held after Matins, in the early morning hours.
The verse Domine, labia mea aperies et os meum annuntiabit laudem tuam is sung at the opening of the first canonical hour of the day
In the practice of Christianity, canonical hours mark the divisions of the day in terms of fixed times of prayer at regular intervals. A book of hours, chiefly a breviary, normally contains a version
Breviary of Beatrice van Assendelft, 1485