what ways did chinese empire during tang-song era depart from previous developments in chinese civilization?

the general level of culture increased rapidly...
kinda Chinese Renaissance

Emphasize on domestic stability thru political reform; adopt imperial examinations----this means that all officials have to pass examinations, and talents were selected out this way as well. Lenient on Tax and tolerant Census. Foreign affairs encourage trade, diplomacy instead of war.

instead of concentrating on wars, it placed more emphasis on education and arts, hence, the tang-song dynasties are famous for their arts, music, literature, etc.