Media content is paired with context-relevant supplemental content, and the media and supplemental content are provided to a user. A media stream containing the media content may be received from a source system, and context information about the media content is determined from information about the media stream. The supplemental content may be selected based on the determined context information. This may enable a business model in which third parties can register advertising or other supplemental content and specify the criteria that cause it to be combined with the media content.