The word "diegetic" describes something that is part of a story or movie's fictional world, including the sounds and visuals that the characters can hear and see. Full definition
Then in our second segment we sink our collective teeth into the topic of diegetic music in video games and how that relates to the fourth wall, idle animations, in - jokes, and characterization in general. (pressthebuttons.com)
The film's multiple intersecting narratives and exhilarating constant use of diegetic music (heard by the characters in the film as well as the audience) create a wonderful sense of time and place. (blog.cinemaautopsy.com)
Throughout, Jonny Greenwood's omnipresent and beguiling score wafts over the drama, melding with diegetic sound, including pieces of music placed in the world of the characters. (indieethos.com)