唐前乐器赋引古曲众多,然大多难考,其《北鄙》《白登》《幽兰》三曲称引较为普遍,但在作者、称名等处各有含混。经考辨,《北鄙》为二曲共称,其作者分为师延、师涓;《白登》非《白台》之误,此曲亦有二,《平城歌》或为其一;“幽兰”为琴曲名,“古琴幽兰”之说不确,而此曲在战国末期已流传于世。 Tang before the introduction of many ancient music instruments, but most of the difficult test, the “North despicable,” “White,” “Orchids,” said the three songs are more common, but the author, such as the name of the ambiguous. After examination, “North despicable” is a total of two songs, the author is divided into teacher extension, teacher Juan; “Biden” is not “Baita” mistake, this song also has two, “Ping Chen Song” or as one ; “Orchids” for the song name, “Guqin Orchids” is not true, and this song has been circulating in the late Warring States period.