A little help coding a plugin.

There doesn't seem to be a rhythmbox forum, so i'm using this email list. :)

I've got some python code that will get search results from
Grooveshark, and will also fetch an mp3 stream of the chosen song.

I want to integrate this into Rhythmbox. So, how do I get calls from
the Source gui, and then how do I add songs to the list?

Thanks!

~Mark