The Polyeleos is a festive portion of the Matins or All-Night Vigil service as observed on higher-ranking feast days in the Eastern Orthodox, Eastern Lutheran, and Byzantine Rite Catholic Churches. The Polyeleos is considered to be the high point of the service, and contains the reading of the Matins Gospel. Because of its liturgical importance, settings for the Polyeleos have been composed by Sergei Rachmaninoff and others. The name derives from Greek Πολυέλεος (pl. Πολυέλεοι), meaning "of much mercy", because of the repetition in one of the Polyeleoi of the phrase "ὅτι εἰς τὸν αἰῶνα τὸ ἔλεος αὐτοῦ" (hoti eis ton aiōna to eleos autou), meaning "because forever [lasts] His mercy"), Psalms Specifically, the Polyeleos consists of Psalms 134 and 135 (Septuagint numbering; King James Version: Psalms and ), which are solemnly chanted in a festive melody, with refrains Alleluia chanted between each verse. The refrain for Psalm 134 is "Alleluia". The refrain for Psalm 135 is "Alleluia, alleluia. For His mercy endureth forever. Alleluia." This repeated chanting of the word "mercy" is another reason for the chanting of these psalms to be called Polyeleos. In its fullest musical setting, it can last up to over an hour. Nowadays, the psalms are usually shortened to only a few select verses each, except in certain monasteries. During the chanting, Holy Doors are opened, and the clergy come out of the sanctuary to stand in front of the icon of the feast, which lies on an analogion in the center of the nave. The deacon (or priest, if there is no deacon) censes the icon of the feast being celebrated. However, if it is a Sunday service, the Holy Doors are opened, the clergy remain in the sanctuary and the priest censes the front of the Holy Table (altar). On feast days, the Polyeleos is followed by selected verses of other psalms which are relevant to the feast. In the Greek Orthodox tradition, these verses are referred to as the eklogarion; in the Russian Orthodox usage a hymn called the megalynarion (magnification) is chanted between these selected verses, while the clergy perform a full censing of the church. On Sundays, in place of the eklogarion, a hymn called the Evlogitaria is chanted in honor of the Resurrection, commemorating the journey of the Myrrhbearers on their way to the Tomb of Christ and the announcement of the Resurrection of Jesus. If a feast