MusiK is Kowari's demo application. It does seem to have problems with some Mp3 metadata in iTunes but the supplied Mp3 in the data directory works. The UI is still a little rough (you have to scroll up the panel divider in OS X, for example). The point though is to show how to write an application using Kowari and the speed at querying, loading, etc.
MusiK (Music Player for Kowari).
Kowari now uses JID3 - A Java ID3 Class Library Implementation (in CVS) and it seems to do a better job of not dying when parsing the ID3 tags.