Ni Hao Katia,
You might find interesting to listen those tracks (remixed from original recordings) :
Laurent also mix those sounds together http://official.fm/tracks/2aWg
and a documentary trailer is visible here :
Interesting stuff to me : i wish to share. He might be able to give u info.
Mathias did a trip about jew harp from Europe back and forth by land, here is an article, you might be able to exchange with him. http://mathias.lazuro.net/2011/11/cd-mongol-mongolia-and-china/
To me you can find music in cities, from here to there you ll find good traditionnal musicians as they can live from it in some places. I would say this would be partly or mainly about han traditionnal music or han influenced minorities (as the Bai and Naxis in Yunnan who also perform in orchestras who are much influenced by han music).
Then in the villages and couties mentionned by Olivier, and in Yunnan I would say, you can "fall on" an event including traditonnal music (more or less remote ethnic minorities ceremonies). I just wish you luck for that !
if you are in china , beijing ,ple come to classic art and music and culture!!you can discover !!!!!and call me , i will wait for you ,frind !
li bo wang !