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
The site is currently in abeyance, in much need of update, but all issues of the CHIME journal are available there.
For some of the excellent work going on within China on Chinese music and ritual, see