A method (500, 700) for a control device (126, 128, 300) configured for controlling a media playback system, the media playback system comprising a plurality of playback zones each comprising at least one respective playback device (102, 104,106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 200), the method comprising: displaying (502, 702, 902) a graphical user interface (600, 800, 1000) comprising an indication of a first zone, wherein the graphical user interface does not comprise an indication of a plurality of additional zones; and detecting (504, 710, 908), by the control device, a single user input that indicates a command to: determine a second zone of the plurality of additional zones; cause the first zone to form a zone group with the identified second zone, wherein all playback devices in a zone group play back media in synchrony; and cause the zone group to play back media in synchrony; and characterised by: based (506, 712, 910) on the detected input: determining the second zone based on a detected signal strength, wherein the signal strength is the signal strength of a playback device playing media in a potential zone that the first zone might join with, and is detected by a playback device in the first zone; causing the first zone to form the zone group with the second zone; and causing the zone group to play back in synchrony the media that the second zone is currently playing. displaying (502, 702, 902) a graphical user interface (600, 800, 1000) comprising an indication of a first zone, wherein the graphical user interface does not comprise an indication of a plurality of additional zones; and detecting (504, 710, 908), by the control device, a single user input that indicates a command to: determine a second zone of the plurality of additional zones; cause the first zone to form a zone group with the identified second zone, wherein all playback devices in a zone group play back media in synchrony; and cause the zone group to play back media in synchrony; and determine a second zone of the plurality of additional zones; cause the first zone to form a zone group with the identified second zone, wherein all playback devices in a zone group play back media in synchrony; and cause the zone group to play back media in synchrony; and characterised by: based (506, 712, 910) on the detected input: determining the second zone based on a detected signal strength, wherein the signal strength is the signal strength of a playback device playing media in a potential zone that the first zone might join with, and is detected by a playback device in the first zone; causing the first zone to form the zone group with the second zone; and causing the zone group to play back in synchrony the media that the second zone is currently playing. determining the second zone based on a detected signal strength, wherein the signal strength is the signal strength of a playback device playing media in a potential zone that the first zone might join with, and is detected by a playback device in the first zone; causing the first zone to form the zone group with the second zone; and causing the zone group to play back in synchrony the media that the second zone is currently playing.