Assertion: gregorian chant | /r/CapableOf | take shape
Facets:
value: in the ninth century
type: TEMPORAL
Source sentences:
text: Singing has been a part of the liturgy since the early days of the Catholic Church, but Gregorian chant -- which began to take shape in the ninth century -- is the earliest form of liturgical music that was written and preserved for the historical record, he said.