Kingston compares Chinese music to Western music to underline some of the difficulties she and others have had in multicultural interactions. Take a visit to this Chinese music archive and listen for a while. If you're not familiar with Chinese music, does this help you understand the essay better? If you are, does this site present a good sampling of the form?
This introductory info about Chinese Immigration to the U.S. will put Kingston's work into a broad historical context.
If you want to put Kingston's work into a literary context, check out these Chinese Mythology links. (Here's an annotated FAQ with links about Mulan. How does what you learn here differ from the version made popular by Disney?)
Interested in what other Kingston enthusiasts have to say? Here is a message board discussing Kingston's life and work.