According to Amiot one of the great court functions is the singing of the "Hymn to the Ancestors," which is conducted by the Emperor. Outside the hall where this ceremony takes place are stationed a number of bell and gong players who may not enter, but who, from time to time, according to fixed laws, join in the music played and sung inside. In the hall the orchestra is arranged in the order prescribed by law: the _ou_, or wooden tiger, which ends every piece, is placed at the northwest end of the orchestra, and the _tschou_, or wooden box-drum, which begins the music, at the northeast; in the middle are placed the singers who accompany the hymn by posturing as well as by chanting. At the back of the hall are pictures of the ancestors, or merely tablets inscribed with their names, before which is a kind of altar, bearing flowers and offerings. The first verse of the hymn consists of eight lines in praise of the godlike virtues of the ancestors, whose spirits are supposed to descend from Heaven and enter the hall during the singing of this verse by the chorus. Then the Emperor prostrates himself three times before the altar, touching his head to the earth each time. As he offers the libations and burns the perfumes on the altar, the chorus sings the second verse of eight lines, in which the spirits are thanked for answering the prayer and entreated to accept the offerings. The Emperor then prostrates himself nine times, after which he resumes his position before the altar, while the last verse of eight lines, eulogistic of the ancestors, is being chanted; during this the spirits are supposed to ascend again to Heaven. The hymn ends with the scraping of the tiger's back and striking it on the head.