 "Gushi" is the style based upon older forms of shi, but allowing new additions to the corpus (unlike the fixed corpus of the "classic "shi"" of the "Shijing").One type of poetry imitative of "old" poetic forms is the Literary Yuefu.The literary "yuefu" include imitations in the style of original Han Dynasty ballad lyrics or imitations of the original "Southern-style" ballad lyrics from the Six Dynasties.