九张机，大曲，在《乐府雅词》中有两词，并收录入《钦定词谱》，有据可依的仅有此两词。 此体有两种格式，一种为前后有口号，整曲共十一首。一种为前后无口号整曲有九首。有口号者，为正格。 后人多有效仿，而很多格律不端，因《乐府雅词》仅收录两首，故格律无别所效。(Nine machines, two words in Daqu, "Yuefu elegance", and recorded "James poems", according to the only two words. This body has two forms, one is the front and the back, and the whole is eleven. As a whole has the first song and no slogan. There are slogans, for normal. More effective imitation, and a lot of irregular law, because the "Yuefu elegant word" only included two, so the law has no effect.)