Comment 3 for bug 448710

This is because of the HUGE amount of posts in Jaunty asking for the close button to minimize Rhythmbox. I, personally, preferred this behavior (close is close, not minimize). Like Sebastien said, you can disable this in gconf, but then you also lose the ability to minimize Rhythmbox by clicking the tray icon. I wrote a patch adding a "Minimize to Tray" checkbox to the status icon preferences that, when unchecked, causes Rhythmbox to close when clicking the close box, and still allows you to minimize Rhythmbox by clicking the tray icon. When you can't please everyone, add an option :)