 Yuefu were a development of the forms of poetic literature collected by or edited by the Han Dynasty Music Bureau.In later dynasties the term "yuefu" ("Music Bureau") was used to identify these officially propagated ballad-style poems, as well as being used as a descriptor for poems in the "yuefu" style, as it came to be elaborated by following poets.These later "yuefu" were sometimes distinguished from the classic anthology pieces by qualifying these "yuefu" as "new" or "literary" ""yuefu"".