《宋书·志·卷十九》
近来音乐已经荒疏，羽佾之舞尚未形成，移风易俗，确实就在今天。
顷自金龠弛韵，羽佾未凝，正俗移风，良在兹日。
Recently music has been neglected and feather-wearing and dancing have not yet been formed. Changing customs and habits should be done today.