A fine site for modern China, including religion, is
Useful sites for Chinese religion are
along with this network:
For the anthropology of religion in China, you can’t beat the oeuvre of Adam Yuet Chau: http://www.ames.cam.ac.uk/directory/chauayuetchau (and links to pdfs there).
For Chinese music, see e.g. the CHIME site
(where all issues of the CHIME journal are available too).
For some of the excellent work going on within China on Chinese music and ritual, see