Free streaming music services try to get at what their users want in different ways. With Pandora, users choose a genre or artist to suit their mood; Spotify offers a similar model. But Songza — the latest hot player on the scene — literally goes after a listener’s mood. In playlists assembled by the Songza team, users can choose a “Brooding” playlist or even a “Hanging Out in the Man Cave” playlist through the app to get at exactly the kind of music they want to hear. Users can, of course, vote songs up or down, and the app will adapt to your personal song style. And, somehow, Songza manages to do it all without ads — enjoy it while it lasts. Free, for iOS and Android devices, including the Kindle Fire.