iTunes Store RSS feed by Artist Id?

I'm having trouble configuring the URL to load an RSS feed of a particular artist's music into my app.I'm using itunes XMLPerformace test Xcode project available on dev.apple. I simply want to change:

   [NSURL URLWithString:@"http://ax.phobos.apple.com.edgesuite.net/WebObjects/MZStore.woa/wpa/MRSS/newreleases/limit=300/rss.xml"];

into something that will load an artist's songs into the table view instead of the newreleases.

This resource seems to suggest additional feed generator options are availble, just not readily.http://www.apple.com/itunes/affiliates/resources/blog/introduction---rss-feed-generator.html

Has anyone come across this?