Assertion: orchestra's instrument | /r/HasProperty | added
Facets:
value: gradually
type: DEGREE
Source sentences:
text: Gradually the other instruments were added.
text: Various percussion and folk instruments were also added.
text: The tuning of the instruments was shifted to the equal-tempered tuning system, and further instruments such as liuqin, zhuihu, yunluo and paigu were added to enhance the sound and range of the orchestra.