1. A method comprising: displaying an area on a user interface of a controller, the area associated with an artist name, an album name, and a track name associated with an audio track that is being played by one or more playback devices, wherein the one or more playback devices is controlled via the controller; receiving a selection of a location in the area of the user interface; responsive to receiving the selection of the location, identifying by the controller at least one audio source that is accessible for searching from the controller; searching the at least one audio source based on at least one search classification field supported by the at least one audio source for any of the artist name, the album name, and the track name; retrieving information by the controller from the at least one audio source based on the search, wherein the information includes any one or more of the following: information related to the artist name, information related to the album name, and information related to the track name; sorting the information based on the at least one search classification field and the at least one audio source; and displaying the sorted information on the user interface.