An example embodiment may involve receiving an indication of media content selected by way of a first client device. The indication may specify that the media content has been flagged for audible playout at a later time (such as when the client device or its user is in an automobile). The example embodiment may further involve receiving a request to stream the audio file to a second client device. The second client device may be associated with the first client device. The example embodiment may further involve causing the audio file to be streamed to the second client device.