These boy lectors were too young for the grammar school, but were valued as choristers, and so were included in the Schola Cantorum or choir school. Originally under the responsibility of the deacons, the organisation of choirs was reformed by Pope Gregory the Great, who introduced the office of primicerius or head cantor for this purpose. This proved a vital reform; as without any comprehensive system of musical notation, the only way that sacred music could be maintained and passed on was through professional choirs of sound musical training undertaking cathedral worship – and such skills are not guaranteed to be present in high-ranking ecclesiastics.