This ci is regarded as Yan Shu’s masterpiece, because it conveys deep sentiments using few words. The first two lines of the second stanza are particularly admired for their parallelism and neat contrast. The song expresses feelings of sorrow and regret at the passage of spring. As in many of Yan Shu’s songs, there is no way to determine if the person being described is male or female. This is unusual and must be deliberate. It imparts to his songs a certain universality. The person before us could be anyone.

The ci genre of Chinese poetry first emerged in the Sui dynasty (581-619), was further developed in the Tang dynasty (618-907) and matured in the Northern Song dynasty (960-1127). Ci is usually translated into English as "song lyrics". This is because ci were composed by poets to fit pre-existing tunes. The number of lines, the line lengths, and the tonal and rhythmic patterns of ci vary with the tunes, which number in the hundreds. One common occasion for composing ci would be a banquet: song lyrics would be scribbled down by guests and then sung by musical performers as entertainment. Other occasions for composing and enjoying ci would be more casual: the poet might sing the lyrics to himself at home or while travelling (many ci poets were civil servants of the Imperial Court and often had to travel great distances to carry out their work). Sometimes the lyrics would be sung by ordinary people in the same way as folk songs. This oral and musical quality sets it apart from other genres of poetry in China during the same period, which were largely written texts with more elevated objectives. There are two main types of ci: wǎnyuē (婉约, "graceful") and háofàng (豪放, "bold"). The wǎnyuē subgenre primarily focuses on emotion and many of its lyrics are about courtship and love, while the háofàng subgenre often deals with themes that were considered more profound by contemporary audiences, such as ageing and mortality, or the rewards and disappointments of public service.

Yan Shu, a powerful statesman in the early Northern Song court, had a long and successful career both as an official and as a poet. Among his many literary achievements (which include poetry, song lyrics and prose) his ci compositions are best known. His lyrics are elegant in their choice of words, controlled in the emotions they express, and not as playful as the ci of other well-known poets. They often capture feelings of solitude and sorrow, creating a melancholic mood, but the poet is rarely explicit about what triggers the worry or sadness.

Chang, Kang-i Sun. The Evolution of Tz’u Poetry: from Late Tang to Northern Sung. Princeton UP, 1980. A standard survey of the early history of Chinese song lyrics (romanized as both ci and tz’u).

Egan, Ronald. “The Song Lyric.” The Cambridge History of Chinese Literature, vol. 1, edited by Stephen Owen, Cambridge UP, 2010, pp. 434-452. An overview of the genre.

Owen, Stephen. Just a Song: Chinese Lyrics from the Eleventh and Early Twelfth Centuries. Asia Center, Harvard UP, 2019. A recent new history of the genre.

Tang, Guizhang 唐圭璋, editor. Quan Song Ci 全宋詞. Zhonghua shu ju, 1965. 5 vols. A comprehensive edition of ci from the Song dynasty and the source text for the ci in this collection (introductions and annotations are in Chinese).