1. A method performed by a first playback device, the method comprising: receiving first control information from a controller device via at least one data network, the first control information comprising identification of an audio information source and instructions for the first playback device to play first audio information from the audio information source identified by the first control information; in response to receiving the first control information, performing a first set of functions comprising: (1) obtaining the first audio information from the first audio information source identified by the first control information and (2) playing back the audio information individually; receiving second control information from the controller device, the second control information comprising identification of an audio information source, instructions for the first playback device to play second audio information from the audio information source identified by the second control information, and an indication that the first playback device is to operate in a first synchrony group state in which the first playback device is designated as a group master of a first synchrony group, wherein the group master provides the second audio information to each other member of the first synchrony group and coordinates synchronous playback of the second audio information in the first synchrony group, and wherein the first synchrony group comprises a second playback device; in response to receiving the second control information, performing a second set of functions comprising: (1) obtaining the second audio information from the audio information source identified by the second control information, (2) operating in the first synchrony group state, and (3) playing back the second audio information in synchrony with the second playback device, wherein operating in the first synchrony group state comprises providing the second audio information to each other member of the first synchrony group and coordinating synchronous playback of the second audio information in the first synchrony group; while operating in the first synchrony group state, receiving third control information from a third playback device that is not a member of the first synchrony group, wherein the third control information comprises instructions for the first playback device to transition from the first synchrony group state to a second synchrony group state and an indication that the first playback device will be a group member of a second synchrony group, wherein the second synchrony group comprises the third playback device and the first playback device, and wherein the third playback device is a group master of the second synchrony group; and in response to receiving the third control information, performing a third set of functions comprising: (1) transitioning from operating in the first synchrony group state to the second synchrony group state, (2) obtaining, from the third playback device, third audio information and associated playback timing information, and (3) using the playback timing information to playback the third audio information in synchrony with the third playback device.