Kaigen Gagaku

… In 626 (the 9th year of Wude), the first emperor of the Tang Dynasty (618-907), Gaozu, ordered his son Zu Xiaosun to adopt the theory of seven tones, twelve tunes, and eighty-four tones, and established the “Music of the Twelve Harmonies,” which was performed at suburban temples, ancestral temples, the First Silkworm Festival, and morning assemblies in the palace courtyard. Later, during the reign of Xuanzong, three harmony was added, and a large-scale gagaku called Kaiyuan Gagaku was established. After the three great dances (the Seven Virtue Dance, the Nine Merit Dance, and the Shangyuan Dance) were created during the reigns of Taizong and Gaozong, many similar banquet music pieces were created, leading to the establishment of the two-piece troupe (the Standing Dance and the Sitting Dance) consisting of 14 pieces. …

*Some of the terminology used in reference to "Kaigan Gagaku" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　唐朝(618‐907)初代高祖は626年(武徳9)祖孝孫に命じて七声十二律八十四調の理論を採用させ，〈十二和之楽〉を制定して郊廟，宗廟，先蚕の祭，殿庭の朝会などに演奏した。のちに玄宗の時，さらに三和を加え，開元雅楽と称する大規模な雅楽を制定した。また太宗，高宗の時に制作された三大舞(〈七徳舞〉〈九功舞〉〈上元舞〉)以後，同様の宴饗楽が多く作られ，14曲よりなる二部伎(立部伎，坐部伎)の制定に至った。…

※「開元雅楽」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報