Psalm 51 is one of the penitential psalms. Also almsgiving as a penitential act became more common. Settings of individual penitential psalms have been written by many composers. A variety of "piyyutim", medieval penitential prayers, are recited regarding themes of repentance. Clerics and laity increasingly recognised Jerusalem as worthy of penitential pilgrimage. They also retained the violet or black vestments for the penitential season. In particular, the penitential Psalm 50 is very widely used. In the period leading up to Rosh Hashanah, penitential prayers, called "selichot", are recited. During the processions, members precede the "pasos", dressed in penitential robes. In Western Europe, Jerusalem was increasingly seen as worthy of penitential pilgrimages. It precedes the Christian penitential season of Lent. Michael Howard subsequently ordered him to visit Liverpool on a "penitential pilgrimage". Alleluias are not sung during penitential times, such as Lent. This was three days for penitential and religious services. Their music mixed folk song styles with penitential or apocalyptic texts.