What a load of crap software! It adds every song you ever play automatically to your library. So, if you only want to play some audio books, but not mingling them with your music collection, you're lost. Apart from that, by default you can't even choose the folder for your library. It just says "multiple folders" and can't be altered unless you deactivate the Ubuntu One music store plugin. Canonical (who develops Ubuntu) should be ashamed to have chosen this piece of turd software as their default player. Try Clementine and you'll have more luck. Hell, even Exaile is better, though it's much simpler.