18. The system of claim 17 , wherein the first visual content item comprises at least one of image content or video content.
17. A system comprising: a data store that stores audio content; and a computing device, comprising one or more processors, in communication with the data store and that is configured to at least: receive a request for playback of at least a subset of the audio content stored in the data store; in response to the request for playback of the audio content: retrieve, from one or more data stores, companion content associated with the audio content, the companion content including textual content representing words that are audible in the audio content; determine a first keyword associated with a first portion of the textual content; determine a second keyword associated with a second portion of the textual content; retrieve, from one or more data stores a first visual content item associated with the first keyword and a second visual content item associated with the second keyword; and cause presentation of the first visual content item and the second visual content item during output of corresponding portions of the audio content, such that (a) the first visual content item is presented during output of an audio content portion corresponding to the first portion of the textual content and (b) the second visual content item is presented during output of an audio content portion corresponding to the second portion of the textual content.