China's Song Dynasty (960–1279), another reunification era after a brief period of disunity, initiated a fresh high culture. Several of its greatest poets were capable government officials as well including Ouyang Xiu (1007–1072), Su Shi (1037–1101), and Wang Anshi (1021–1086). The "ci" form flourished as a few hundred songs became standard templates for poems with distinctive and variously set meters. The free and expressive style of Song high culture has been contrasted with majestic Tang poems by centuries of subsequent critics who engage in fierce arguments over which dynasty had the best poetry. Additional musical influences contributed to the Yuan Dynasty's (1279–1368) distinctive "qu" opera culture and spawned the "sanqu" form of individual poems based on it.