Right click Audio, and select Add Library View...
- Select a view type that approximates the one you want (panes, categories, ..., or blank).
- Name it
- Right-click the newly create view and Customize
- Set View As to the type of view, if it is not already set to the desired type
- Add the Categories you want, such as Composer
- Additional rules are set on the right-side; maybe you only want Classical music to show here, so use Set rules for file display...
That's the idea. See:
http://yabb.jriver.com/interact/index.php?topic=68960.0for the full song and dance.