Although it is designed for fellow artists, you might have more luck making a post on the Indaba message boards;
http://www.indabamusic.com/forums/2
If you have a budget you can try contacting http://www.musicdealers.com/
I can offer you one of my original tracks for licensing but not sure it would be what your looking for 
http://soundcloud.com/dj-tom-field/tom-field-guzheng
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