《梦溪笔谈·乐律一》
现在的人却不再懂得曲调原本是有悲哀、欢乐之别的，所以往往用悲哀的曲调去吟唱欢乐的歌词，或者用欢乐的曲调去吟唱悲哀的歌词。
今人则不复知有声矣，哀声而歌乐词，乐声而歌怨词。
However, nowadays people do not understand that music originally distinguished between sorrow and joy, so they often sing happy lyrics with sad tunes, or sing sad lyrics with happy tunes.