Final answer:
Diegetic music is the film music that comes from a source within the film's environment and can be heard by both the characters and the audience.
Step-by-step explanation:
The type of film music that emanates from a source within the film, such as a radio, phonograph, or musical instrument, and is apparent to both the characters and the audience is called Diegetic music.
Diegetic music is part of the narrative environment and can also be referred to as "source music". The characters in the film can hear and sometimes interact with this music. It contrasts with non-diegetic music, which is added to the film for dramatic effect and is not heard by the film's characters, such as a film score or soundtrack. An example of diegetic music could be a character turning on a radio or a band playing live within a scene.