A method of sharing access to a media service for a media playback system comprising: transmitting, from the media playback system, to a server or computing system associated with a media service a request for identification information associated with an authorization token that corresponds to a media application installed on a computing device that is authorized to access media from the media service using the media application, wherein the authorization token is operable to provide the media playback system with access to the media service, and wherein the identification information comprises one or more login names or user names corresponding to a particular media service account associated with the media application installed on the computing device; receiving, by the media playback system, the identification information from the media service; comparing the received identification information with one or more media-service accounts associated with the media playback system; and based on the comparison: assigning to the computing device control permissions that enable one of: unrestricted control over the media playback system; and restricted control over the media playback system; and determining whether to use the authorization token corresponding to the media application installed on the computing device or an authorization token previously stored by the media playback system to obtain media from the media service. transmitting, from the media playback system, to a server or computing system associated with a media service a request for identification information associated with an authorization token that corresponds to a media application installed on a computing device that is authorized to access media from the media service using the media application, wherein the authorization token is operable to provide the media playback system with access to the media service, and wherein the identification information comprises one or more login names or user names corresponding to a particular media service account associated with the media application installed on the computing device; receiving, by the media playback system, the identification information from the media service; comparing the received identification information with one or more media-service accounts associated with the media playback system; and based on the comparison: assigning to the computing device control permissions that enable one of: unrestricted control over the media playback system; and restricted control over the media playback system; and determining whether to use the authorization token corresponding to the media application installed on the computing device or an authorization token previously stored by the media playback system to obtain media from the media service. assigning to the computing device control permissions that enable one of: unrestricted control over the media playback system; and restricted control over the media playback system; and unrestricted control over the media playback system; and restricted control over the media playback system; and determining whether to use the authorization token corresponding to the media application installed on the computing device or an authorization token previously stored by the media playback system to obtain media from the media service.