I’m always concerned to trace the story of research on ritual in China under the first fifteen years of Maoism from the 1949 “Liberation” until the eve of the Cultural Revolution. I’ve introduced the impressive 1956 project on Daoist ritual in Suzhou, and Yang Yinliu’s remarkable fieldwork in Hunan that same year (following his 1952–53 study of the music of the Zhihua temple in Beijing); the “Buddhist music” of Wutaishan was an early topic; and my post on a 1960 report on “old customs” of Wenzhou includes further links, as does Images from the Maoist era. I’ve commented on how the very concept of “Daoist/Buddhist/religious music” misleadingly ringfences the topic, when soundscape should anyway be a major element of ritual studies.
1966 was the major cut-off point, but research (and ritual practice) was highly constrained after the Socialist Education campaigns began in 1963; and already by 1957–58 the Anti-Rightist campaign and Great Leap Backward had disastrous consequences (see Cultural Revolutions). We can find several more signs of life on the eve of the Leap, such as the Xi’an scholar Li Shigen’s 1959 report on his 1957 visit to the White Cloud Mountain in Shaanbei. And I just recalled another one,
- Yangzhou daojiao yinyue jieshao 揚州道教音乐介绍 [Introduction to the Daoist music of Yangzhou], edited by the Yangzhou Cultural Association (Wenlian). 
This slim mimeograph of 37 pages, compiled in 1957 and published in 1958, consists mainly of cipher-notation transcriptions of the Qingchui dipu Shifan gu 清吹笛譜十番鼓 gongche solfeggio score for dizi flute of (paraliturgical) melodies for Shifan ensemble, a score which is said to have been handed down in the Chenghuang miao temple since the Ming dynasty.
By contrast with the outstanding work of Yang Yinliu, the pamphlet is entirely reified, with no social context at all on the severely-reduced conditions of ritual activity in the urban temples or the surrounding countryside—but at least it suggests a concern for ritual music at the time, that was only able to get into full swing as traditions and scholarship revived after the collapse of the commune system in the late 1970s.
After a nugatory, formulaic introduction, the transcriptions are in three sections: qingchui dipu 清吹笛譜 solo flute scores, daoqing 道情 popular vocal melodies, with texts, and—most interestingly—twelve zanjing 讚經 hymns, again with texts:
- Baihe ci 白鶴詞
- Jiuku zan 救苦讚
- Putuo qu 普陀曲
- Sanguan zan 三官讚
- Kaijing zan 開經讚 (Songjing gongde 誦經功德)
- Zhaoqing 召請 1
- Zhaoqing 召請 2 (cf. the Invitation ritual in north Shanxi)
- Huanghua dangxing tianzun 黃花荡形天尊
- Zhuangzi tan kulou 莊子嘆骷髏 (again, cf. north Shanxi)
- Qiyan Sanhua 七言散花
- Zhuanlian ji 捲簾偈
- Jishou guiyi 稽首皈依
- Tan fusheng 嘆浮生
Hymn to the Three Officers (Sanguan zan).
Since the 1980s, the Anthology (see my “Reading between the lines: reflections on the massive Anthology of folk music of the Chinese peoples”, Ethnomusicology 47.3, 2003) sometimes affords valuable prospects of local ritual traditions—such as the household Daoists of Changwu, subject of a substantial section in the narrative-singing volumes for Shaanxi. Otherwise, “religious music” mostly appears under the “instrumental music” volumes—supplementing recent fieldwork with studies from the 1950s. For Jiangsu province the coverage of “Daoist music” gives pride of place to Suzhou, Wuxi, and Maoshan; Yangzhou is absent.
Perhaps there has been further study, but Zhu Ruiyun 朱瑞云 (b.1929), the main author of the 1958 mimeograph, finally published a much expanded revision in 2007, Yangzhou daojiao yinyue kao 揚州道教音乐考. Despite all the advances in China in the ethnography of religion since the 1980s, its 366 pages are still largely limited to hackneyed musicological concerns. Zhu had no training in Daoism, but since the 1980s many other cultural workers around China managed to educate themselves about their local Daoist ritual traditions—some (as in Fujian, Jiangxi, and Hunan) becoming considerable authorities, producing a wealth of fine ethnographic work.
The introductory material, including a brief account of ritual practice, consists largely of generic citations from early history; Zhu spectacularly avoids even the briefest reference to any modern ritual activity in Yangzhou. In the transcriptions (now in Western stave notation), the brief section of hymns, after the opening Kaijing zan, even dispenses with the ritual texts that he provided in the 1958 mimeograph.
At least we now learn that the Qingchui dipu Shifan gu score was provided by Sun Guiyuan 孙归源, fourth-generation abbot of the Chenghuang miao temple, to whom Zhu was introduced while he was working the Bureau of Culture in 1957. And the brief account by Sun Guiyuan’s son, written in 1991, tells us that the temple was demolished in 1950 and the score destroyed in the Cultural Revolution.
Alas, this is one book we can well do without. So Daoist ritual around Yangzhou still cries out for detailed research—not only on imperial history, but fieldwork on current activity (both temple and folk),  and studies of change from the Republican to Maoist eras. We may find the 1958 mimeograph meretricious (and a Happy New Year), but I still admire the work of scholars through all the travails of Maoism. Meanwhile, it’s a reminder to return to the splendid work on Daoist ritual around Suzhou and Wuxi.
 In Yangzhou, a more popular topic has been the lively (secular) folk traditions of qingqu 清曲 narrative-singing, which are the subject of many dedicated studies since the Yangzhou qingqu caifang baogao 揚州清曲采访报告 of 1962 (yet another impressive monograph from the Chinese Music Research Institute, in the lull between the famine and the Socialist Education campaigns), and the genre features prominently in the narrative-singing volumes of the Anthology.
 As usual, the most promising approach will be simply to spend time there “among the people”, chatting with locals and perhaps hanging out at funeral shops. Almost wherever one goes, household Daoist (and Buddhist) groups are in demand to provide services for mortuary rituals—as shown even by a popular article like this from 2016, in which the author, on a visit home to Yangzhou, is surprised to find that his father has taken up the Daoist trade late in life. For temple Buddhism, see e.g. this announcement for the Water-and-Land ritual as performed at the Daming si temple.