Music Discovery Dial

A system comprising a command device and a playback device, the command device comprising:

• a physical tuning control;
• a first communications interface;
• at least one first processor;
• and
• a housing carrying the physical tuning control, the first communications interface, the at least one first processor, and at least one first non-transitory computer-readable medium comprising first program instructions that are executable by the at least one first processor such that the command device is configured to:
• detect one or more rotations of the physical tuning control, the physical tuning control comprising multiple regions corresponding to respective streaming audio channels;
• when at least one first rotation of the physical tuning control selects a first region of the multiple regions, cause, via the first communications interface, the playback device to play back a first streaming audio channel corresponding to the first region;
• and
• when at least one second rotation of the physical tuning control selects a second region of the multiple regions, cause, via the first communications interface, the playback device to play back a second streaming audio channel corresponding to the second region;
• and
• wherein the playback device comprises:
• an amplifier configured to drive at least one audio transducer;
• at least one light;
• a second communications interface;
• at least one second processor;
• and
• at least one second non-transitory computer-readable medium comprising second program instructions that are executable by the at least one second processor such that the playback device is configured to:
• while the first region is selected, play back the first streaming audio channel via the amplifier;
• while playing back the first streaming audio channel, illuminate the at least one light to indicate the first streaming audio channel;
• while the second region is selected, play back the second streaming audio channel via the amplifier;
• and
• while playing back the second streaming audio channel, illuminate the at least one light to indicate the second streaming audio channel.