Although the poems in "Nihon Gafu" are about historical events, its descriptions are often different from the ones written in some reliable historical documents, as was the case with "Nihon Gaishi " (Unofficial History of Japan).
ただ『日本楽府』の場合、史実をうたったとは言っても、その描写は往々にして信頼のおける史料との食い違いを見せるなど『日本外史』と似た傾向を持つ。