Location based playback system control

A user device comprising:

• a network interface;
• at least on 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 user device is configured to:
• display a first interface of a control application configured to control a media playback system comprising multiple rooms, the first interface comprising first selectable controls corresponding to respective rooms of the multiple rooms, wherein each room comprises at least one respective playback device, and wherein the first selectable controls are selectable to select one or more of the multiple rooms as playback targets;
• receive, via the first selectable controls of the first interface, input data representing selection, as playback targets, of one or more first rooms from among the multiple rooms;
• send, via the network interface, instructions to play back audio content on one or more first playback devices of the one or more first rooms;
• determine one or more particular playback devices that are within a threshold proximity to the user device;
• display, non-concurrently with the first interface, a second interface of the control application, the second interface comprising second selectable controls corresponding to respective rooms in a proper subset of the multiple rooms, wherein the subset consists of one or more second rooms that include at least one respective particular playback device of the one or more particular playback devices determined to be within the threshold proximity to the user device, wherein the second selectable controls are selectable to select one or more of the multiple rooms as playback targets, and wherein rooms outside of the proper subset are not selectable as playback targets via the second interface;
• receive, via the second selectable controls of the second interface, input data representing selection, as the playback target;
• of a second room from among the one or more second rooms;
• and
• send, via the network interface, instructions to play back additional audio content on one or more second playback devices of the second room.

A method comprising:

• displaying, via a graphical display of a user device, a first interface of a control application configured to control a media playback system comprising multiple rooms, the first interface comprising first selectable controls corresponding to respective rooms of the multiple rooms, wherein each room comprises at least one respective playback device, and wherein the first selectable controls are selectable to select one or more of the multiple rooms as playback targets;
• receiving, via the first selectable controls of the first interface, input data representing selection, as playback targets, of one or more first rooms from among the multiple rooms;
• sending, via a network interface of the user device, instructions to play back audio content on one or more first playback devices of the one or more first rooms;
• determining one or more particular playback devices that are within a threshold proximity to the user device;
• displaying, via the graphical display of the user device non-concurrently with the first interface, a second interface of the control application, the second interface comprising second selectable controls corresponding to respective rooms in a proper subset of the multiple rooms, wherein the subset consists of one or more second rooms that include at least one respective particular playback device of the one or more particular playback devices determined to be within the threshold proximity to the user device, wherein the second selectable controls are selectable to select one or more of the multiple rooms as playback targets, and wherein rooms outside of the proper subset are not selectable as playback targets via the second interface;
• receiving, via the second selectable controls of the second interface, input data representing selection, as the playback target;
• of a second room from among the one or more second rooms;
• and
• sending, via the network interface of the user device, instructions to play back additional audio content on one or more second playback devices of the second room.