Queue versioning

A system comprising:

• a playback device configured to play back from a playback queue;
• and
• at least one at least one non-transitory computer-readable medium comprising program instructions that are executable by at least one processor such that a control device is configured to:
• receive, via a network interface of the control device, data representing first media items queued in a first version of the playback queue and a first queue identifier indicating the first version, wherein at least one playback device is configured to play back from the playback queue, and wherein the playback queue is maintained on an additional device;
• cause a graphical user interface to display a graphical representation of first media items queued in the first version of the playback queue;
• cause the graphical user interface to display at least a portion of a playlist, wherein the playlist includes second media items;
• receive, via the graphical user interface, a selection of a particular second media item from the playlist for playback on the at least one playback device;
• send, via the network interface of the control device, instructions that cause the playback device to replace the first media items in the first version of the playback queue with the particular second media item and second media items subsequent to the particular second media item in the playlist;
• and
• receive, via the network interface of the control device, data representing second media items queued in a second version of the playback queue and a second queue identifier indicating the second version, wherein the second media items queued in the second version of the playback queue include the particular second media item and the second media items subsequent to the particular second media item in the playlist.

A playback device comprising:

• a network interface;
• at least one audio transducer;
• at least one processor;
• and
• at least one non-transitory computer-readable medium comprising program instructions that are executable by the at least one processor such that the playback device is configured to:
• send, via the network interface to a control device, data representing first media items queued in a first version of a playback queue and a first queue identifier indicating the first version, wherein at least one playback device is configured to play back from the playback queue, and wherein the playback queue is maintained on the playback device;
• receive, via the network interface, command to play back a particular second media item from a playlist of second media items;
• according to the received command, replace the first media items in the first version of the playback queue with the particular second media item and second media items subsequent to the particular second media item in the playlist;
• play back the particular second media item from a second version of the playback queue via the at least one audio transducer;
• and
• send, via the network interface to the control device, data representing second media items queued in the second version of the playback queue and a second queue identifier indicating the second version, wherein the second media items queued in the second version of the playback queue include the particular second media item and the second media items subsequent to the particular second media item in the playlist.