I'm having trouble putting it in words. Maybe thats a bad sign. Its kind of like the iTunes DJ but not really. I can tell you that nothing in there is unrelated. Imagine the main library is a completely separate entity from the 'player'. The music player plays from the sidebar. You fill the sidebar with songs from the library.
And yeah I probably should add a menu item for hiding the browser.
I got that in a second reading, and I edited my comment accordingly, here is the relevant bit:
> As someone who rarely uses sub-lists and typically just flips around the main library, copying the entire existing library to the sidebar isn't a great idea. I get it for playlists and other subsections, not so much for the entire unfiltered library.
I guess it's not so simple if the app is built around that concept. I always use my main library and rarely have an urge to structure a queue, so maybe it's just not the app for me.
And yeah I probably should add a menu item for hiding the browser.