General Instruction of the Liturgy of the Hours, 210]</ref> The Ceremonial of Bishops (1984) says: "It is also desirable that, if at all possible, the bishop take part with the clergy and people in the office of readings and morning prayer on Good Friday and Holy Saturday." The Office of Readings and Morning Prayer have only 6 psalms (3 in either hour), not the older form's 14, after each of which a candle was extinguished. The readings are no longer 3, divided into 9 sections, but 2 longer readings, and there is provision for extending the Office of Readings on more solemn occasions. In the older form, liturgical practice on those days differed from that on other days, even those of Lent: for instance, Gloria Patri was not included at the end of psalms and responsories. The office of Tenebrae was abandoned at the Church of the Holy Sepulchre in Jerusalem only in 1977 − although the rule against anticipation of Matins and Lauds to the previous evening was already in effect there − because the times of Catholic Holy Week services had to remain unchanged due to the established rights of other churches.Summorum Pontificum (2007) permits clerics bound to recitation of the Divine Office to use the 1961 Roman Breviary. Several religious and secular institutes and societies of apostolic life have availed themselves of this permission. The 1955 and 1960 changes incorporated into that edition of the Breviary continue to exclude anticipation of matins and lauds to the previous evening, whether celebrated with or without the Tenebrae ceremonies. Services called Tenebrae, differing in several respects from the original form and not necessarily connected with Holy Week, are held even where the pre-Vatican II 1961 Roman Breviary is not used: The Jesuit Institute provides a service, denominated Tenebrae, without psalms and not necessarily in darkness, in which a candle is extinguished after the reading of each of seven Scripture passages related to the Passion of Jesus. A modified form of the old-style Tenebrae that leaves the church in darkness is used by the Canons Regular of Saint John Cantius in Chicago. Several Catholic cathedrals and other churches arrange one-off services with Gregorian chant and polyphonic music from the traditional Tenebrae service, sometimes as an evening concert. Unlike the original well-attended Tenebrae, these modern adaptations have attracted little attention on the part of musical composers. Other Western Christian Churches Some Protestant