The radio accompanies the characters without waiting for an important scene to begin. Its presenters and adverts make the world seem to keep on going while each driver deals with their own problems.
A recognisable station across separate lives
KHJ Boss Radio gives Once Upon a Time in Hollywood a presence that runs through spaces and characters. The signal comes into the cars and accompanies journeys across a vast city. The protagonists may have different destinies and still listen to the same radio culture. That coincidence creates closeness without requiring them to meet or to know what the other is doing.
The station existed, and its sound belongs to the Los Angeles landscape recreated by the film. Mary Ramos explained the work with its archives on KCRW. The selection was not limited to gathering songs released before 1969: it also incorporated the broadcast context around them. Presenters and advertising make it possible to recognise a schedule, with a personality that an isolated list of songs would not preserve.
Fred Raskin said that the team catalogued KHJ recordings to locate material by date, song and presenter. That organisation made it easier to choose specific snippets during the edit. The archive’s precision served a cinematic construction; it does not mean that all the sounds of a day in the story reproduce a complete, uninterrupted broadcast from the same historical day.
The difference is audible. A song arrives preceded or followed by a voice that introduces a sense of companionship. The presenter seems to be speaking to someone who is driving, working or staying at home. The film uses this address to an everyday listener to build intimacy with the period, without needing the characters to explain what the station means to them.
The adverts also preserve a way of living
A radio advert contains more information than the product it is trying to sell. Its intonation, speed and the familiarity it adopts with the listener reveal conventions of communication. By preserving these fragments, the film lets us hear how consumerism was presented within a music schedule. Advertising is part of the atmosphere, even if the viewer has no interest in buying anything being advertised.
The short jingles fulfil a similar function. They identify the station, separate content and maintain a recognisable continuity between different songs. Their repetition creates a sonic brand that can quickly feel familiar. In the story, that familiarity helps the city seem inhabited before the camera reaches each place.
The effect would be different if only complete songs were heard as external accompaniment. The cuts, voices and small interruptions remind us that there is a machine switched on within the narrated world. The music is not always offered in ideal listening conditions: it may compete with the engine, a conversation or the driver’s attention. That texture contributes to the sense of everyday life.
The distinction between diegetic and non-diegetic music is useful for describing those changes. When the source belongs to the character’s space, the viewer can recognise an experience shared with them. If the song expands over a montage, its function can take on greater breadth. The film works with that flexibility without having to explain each transition.
Listening also takes time.
The radio organises the time of journeys
Driving takes up an important part of Rick, Cliff and Sharon’s lives. The radio prevents those journeys from being reduced to mere links between scenes. It makes duration, mood and changes in energy perceptible. A journey can feel carefree or weary depending on the combination of movement, song and the character’s attitude, even when no new conflict appears.
The cuts within a journey can also change the sonic fragment, making it clear that time has passed. Continuity then comes from the experience of driving and listening, not from preserving a song without interruption. The viewer accepts spatial jumps because they recognise a routine. The station provides a stable framework within which specific moments can vary.
The film soundtrack brings together songs with different functions, and KHJ explains part of its organisation. Not every piece should automatically be attributed to a real broadcast. The interest of the radio lies in how it introduces selection, mediation and companionship: someone seems to be programming music for the city while the characters try to organise their own lives.
That mechanism sets KHJ apart from a simple nostalgic collection of hits. Nostalgia may emerge, but the sound also has a narrative function. It links days, fills silences and gives Los Angeles an activity independent of the protagonists. The world does not wait for Rick to begin a song, nor does it suspend an advert because he is worried.
In comparison with other uses of radio in Tarantino’s cinema, what stands out here is its ability to sustain an ordinary present. The voices do not necessarily announce the danger approaching. They maintain the surface of a city where people keep listening, buying and driving. That everyday continuity makes the time the characters inhabit more tangible, and the story strives to prolong it.
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