15. A system comprising: a display; a processor; and a memory device including instructions that, when executed by the processor, cause the system to: identify a semantic meaning associated with one or more words in an electronic document being displayed on the display, the one or more words being located at a specific location of the electronic document; identify an audio file associated with the semantic meaning; determine a gaze direction of a user relative to the display; determine an estimated location on the display corresponding to the gaze direction; determine that the estimated location is within a threshold distance from the specific location of the one or more words; and play the audio file with a volume based at least in part upon the semantic meaning of the one or more words and a determination that the estimated location is within the threshold distance from the specific location of the one or more words.
20. The system of claim 15 , wherein the audio file is at least one of a song, a poem, a soundtrack, background music, an ambient sound, or a sound effect, and wherein the electronic document is at least one of an electronic book, a word processing file, a slideshow file, or an electronic message.