These protocols gave rules for imperial progresses to and from certain churches at Constantinople and the imperial palace, with fixed stations and rules for ritual actions and acclamations from specified participants (the text of acclamations and processional troparia or kontakia, but also heirmoi are mentioned), among them also ministers, senate members, leaders of the "Blues" (Venetoi) and the "Greens" (Prasinoi)—chariot teams during the hippodrome's horse races. They had an important role during court ceremonies. The following chapters (84–95) are taken from a 6th-century manual by Peter the Patrician. They rather describe administrative ceremonies such as the appointment of certain functionaries (ch. 84,85), investitures of certain offices (86), the reception of ambassadors and the proclamation of the Western Emperor (87,88), the reception of Persian ambassadors (89,90), Anagorevseis of certain Emperors (91–96), the appointment of the senate's proedros (97). The "palace order" did not only prescribe the way of movements (symbolic or real) including on foot, mounted, by boat, but also the costumes of the celebrants and who has to perform certain acclamations. The emperor often plays the role of Christ and the imperial palace is chosen for religious rituals, so that the ceremonial book brings the sacred and the profane together. Book II seems to be less normative and was obviously not compiled from older sources like book I, which often mentioned outdated imperial offices and ceremonies, it rather describes particular ceremonies as they had been celebrated during particular imperial receptions during the Macedonian renaissance. The Desert Fathers and urban monasticism Two concepts must be understood to appreciate fully the function of music in Byzantine worship and they were related to a new form of urban monasticism, which even formed the representative cathedral rites of the imperial ages, which had to baptise many catechumens. The first, which retained currency in Greek theological and mystical speculation until the dissolution of the empire, was the belief in the angelic transmission of sacred chant: the assumption that the early Church united men in the prayer of the angelic choirs. It was partly based on the Hebrew fundament of Christian worship, but in the particular reception of St. Basil of Caesarea's divine liturgy. John Chrysostom, since 397 Archbishop of Constantinople, abridged the long formula of Basil's divine liturgy for the local cathedral rite. The notion of angelic chant is certainly older than the Apocalypse account (Revelation 4:8–11), for the musical function of angels as conceived