Methods, systems, and apparatus, including computer program products, for transitioning the playing of content between devices. In some implementations, a method includes receiving a first notification; receiving media context information identifying media content played by a first player device; associating the media context information with a mobile device; receiving a second notification, and in response to receiving the second notification, instructing a second player device to begin playing media content. Capability information indicating types of content that the second player can play can be received. The second player can be instructed to play the media content identified in the media context information beginning at a location specified in the media context information or to play second media content related to the identified media content where the second media content has a type that can be played by the second player device.