US Patent 9460755 Queue identification

An example method includes receiving, by a playback device, one or more messages from a control device, wherein the one or more messages identify (i) a playlist and (ii) an application identifier associated with an application; and based on receiving the one or more messages: populating a playback queue with one or more media items associated with the playlist, wherein the playback queue is associated with the playback device; associating the received application identifier with the playback queue; and sending, to the control device, a queue identifier that represents the playback queue.