San Agapito in Palest rina. He was required to play the organ on feast days and to lead the choir at mass, vespers, and compline. He was also expected to instruct the clergy in plainchant or else to undertake the musical education of some of the choirboys (Casimiri 1924; see item E0105). Further documentation of Giovanni's professional activities in Palest rina is lacking until 1551.