The subject matter of the present disclosure can be implemented by, among other things, a network service server system configured to receive authorizations from a remote control application to associate media player devices that are connected to different local area networks with a user account, receive a request from the application to group multiple of the media player devices, and transmit a unique group identifier associated with the multiple media player devices to the application in response. In response to receiving a media playback command that includes the unique group identifier and control information usable by a media player device to control media playback, the network services transmits the control information to the multiple media player devices to control a media playback by the multiple media player devices.