Receiving, by a first zone player, first control information from a user interface module; based on the received first control information, transmitting, by the first zone player, a notification to a second zone player, wherein the notification indicates that the first zone player is joining a synchrony group with the second zone player; receiving, by the first zone player, second control information from the second zone player, wherein the second control information comprises a multicast address that an audio information channelization device uses to broadcast audio information and playback timing information to the synchrony group; and playing, by the first zone player, the audio information in synchrony with the second zone player.