1. A method comprising: instantiating, at a zone audio playback device, a zone group configuration, the zone group configuration causing the zone audio playback device and a second zone audio playback device to be organized according to a zone group such that the zone audio playback device and the second zone audio playback device are configured to play back audio in synchrony, and wherein the zone audio playback device and the second zone audio playback device are communicatively coupled by a first network, wherein each of the zone audio playback device and the second zone audio playback device comprises at least one speaker; sending, by the zone audio playback device, a request for media content to a service provider, the request comprising a uniform resource indicator (URI) associated with the media content; based on the request, retrieving, by the zone audio playback device from the service provider, a streaming audio signal comprising an audio stream and a tag, wherein the audio stream retrieved by the zone audio playback device is based on selection of a song from a playlist of songs displayed on a controller device that is communicatively coupled to the zone audio playback device by a second network, wherein the zone audio playback device is in a zone group with the second zone audio playback device according to the zone group configuration, and wherein the controller device controls playback operations of the zone audio playback device and the second zone audio playback device; parsing, by the zone audio playback device, the received streaming audio signal to identify the audio stream and the tag in the streaming audio signal; after the tag is identified and based on the identified audio stream, playing, by the zone audio playback device in synchrony with the second zone audio playback device in the zone group according to the zone group configuration, at least a portion of the audio stream; based on the identified tag, causing, by the zone audio playback device, an advertisement to be inserted into the playlist of songs being played back and a voiceover related to the advertisement to be included in the playback of at least the portion of the audio stream by the zone audio playback device, the playlist of songs displayed on the controller device, wherein the advertisement inserted into the playlist of songs is associated with an email corresponding to the advertisement, and wherein causing the advertisement to be inserted into the playlist of songs being played back comprises transmitting, by the zone audio playback device, the tag to the controller device; receiving, by the zone audio playback device from the controller device, an indication that the advertisement inserted into the playlist is selected, wherein the selection of the advertisement inserted into the playlist of songs comprises scrolling the playlist to display the advertisement, wherein scrolling the playlist comprises scrolling the songs in the playlist which causes the advertisement in the playlist to scroll; and wherein the selection of the advertisement does not affect playback of the at least the portion of the audio stream by the zone audio playback device; and sending, by the zone audio playback device via a third network, a message to a server affiliated with the service provider of the audio stream to trigger the server to send the email corresponding to the selected advertisement; wherein the advertisement is based on an interest of a user provided by the user to the service provider when the user signed up for an audio service of the service provider.