《元史·列传·卷六十一》
蒙古军攻下汴梁，汴梁的太常乐师流落于东平。当时，祭祀乐章残缺不全，只存《登歌》一章。
时汴梁既下，太常乐师流寓东平，旧章缺落，止存登歌一章而已。
When the Mongolian army captured Bianliang, the musicians of Bianliang's Taichang Temple were scattered to Dongping. At that time, the ritual music was incomplete, and only the "Dengge" chapter was left.