Bande-Son Originale: Film Score vs Soundtrack Explained

Few film terms create as much confusion as “Bande-Son Originale.” If you’ve ever browsed a French movie listing or a vinyl record shop, you’ve seen those three words and wondered whether they mean score, soundtrack, or something else. This article explains exactly what Bande-Son Originale (often abbreviated BO) refers to, how it differs from a film score and a soundtrack, and why the distinction matters for anyone who buys or streams film music. The OQLF, Quebec’s official language authority, defines “bande originale de film” as the soundtrack of a cinematographic production.*

Best-selling film soundtrack of all time: The Bodyguard (1992) – 45 million copies ·
Most Oscar nominations for Best Original Score: John Williams with 53 nominations ·
Number of film scores composed by Ennio Morricone: Over 500 ·
Longest film score runtime (trilogy): The Lord of the Rings – over 11 hours

Here are six key facts that frame the conversation around Bande-Son Originale and its cousin terms.

What is a Bande-Son Originale?

• Literally “original soundtrack” in French
• Often abbreviated as BO
• Broader than “score” – includes pre-existing music

The term “Bande-Son Originale” comes from the French phrase “bande originale de film.” The OQLF (Quebec government language authority) defines it as the soundtrack of a cinematographic production, noting that it may consist of original music or pre-existing music chosen for the film. In France, the abbreviation BO is common and appears on album covers, streaming labels, and movie posters.

What does “Bande-Son Originale” mean literally?

• “Bande” = strip (from the days of magnetic tape)
• “Son” = sound
• “Originale” = original

Originally, the phrase referred to the physical audio strip on a film reel. Today, it is used to describe the commercial music release from a film.

How is it used in French vs English contexts?

• French usage is broader than the narrow English “score” because it can include pre-existing music, according to the OQLF.
• In English, “soundtrack” is a catch-all that often includes score tracks as well.

The implication: Whether you are in Paris or Montreal, a BO release is the album, not the instrumental-only cue sheets.

What is the difference between a film score and a soundtrack?

• Film score: originally written for the film (usually instrumental)
• Soundtrack: can include pre-existing songs and sometimes the score
• OST: Original SoundTrack, the commercial album

StudioBinder (film production resource) explains that a film score is “original music written specifically for a film to support its story and emotion,” while a soundtrack may include songs that were not made solely for the film. MasterClass (online learning platform) adds that a soundtrack album can contain only songs, but in some contexts it can also refer to all music associated with the film.

Here is a direct comparison of the two concepts.

Is soundtrack the same as song?

• No – a song is a single musical composition; a soundtrack is a collection of music from the film.
• Many soundtracks include songs, but they also may include score excerpts.

A soundtrack album may be marketed as featuring music “from or inspired by” the film, according to MasterClass, which means not every track is necessarily heard on screen.

What is the difference between theme song, soundtrack and OST?

• Theme song: a specific piece associated with the film (often played during credits)
• Soundtrack: the broader collection
• OST: abbreviation for Original Soundtrack, almost synonymous with the soundtrack album

WeVideo (online video editor) notes that film score music is usually instrumental and written to match specific scenes, whereas a soundtrack typically consists of pre-existing songs or curated tracks. Yet the line blurs: some modern explainers, like At The Movies Shop (film music retail blog), point out that even albums made up only of instrumental film music may be labeled “soundtracks” rather than “scores.”

Why this matters: If you are shopping for a film album, understanding the label helps you predict whether you will hear a symphonic suite or a pop playlist.

Why do they call it a film score?

• The word “score” comes from the musical notation sheet
• Film score emerged in early cinema
• OST stands for Original Soundtrack

According to Wikipedia the free encyclopedia, the term “score” originally refers to the written musical notation that orchestras read. In cinema, “film score” became the name for the original music composed to accompany a picture. The first synchronized film score was Don Juan in 1926 (as noted in our table).

Why is it called OST?

• OST = Original Soundtrack
• First used in the 1950s when albums were released as “original soundtrack recordings”

MasterClass (MasterClass) clarifies that the term “original soundtrack” is commonly abbreviated as OST. It was coined by record labels to indicate that the music came from the film itself, not a re-recording.

The pattern: The shorthand “OST” signals authenticity – these are the actual recordings heard in the film, not cover versions.

What is the most famous film score of all time?

• John Williams’ Star Wars is widely considered the most iconic
• The Bodyguard holds the sales record for soundtracks
• Ennio Morricone’s spaghetti western themes are legendary

John Williams’ score for Star Wars (1977) is one of the most recognized pieces of film music in history. With 53 Oscar nominations, Williams is the most nominated composer for Best Original Score (Wikipedia the free encyclopedia). Meanwhile, the best-selling soundtrack of all time is The Bodyguard (1992), which sold 45 million copies worldwide (Wikipedia the free encyclopedia). Ennio Morricone composed over 500 film scores, with his theme for The Good, the Bad and the Ugly among the most imitated in popular culture (Wikipedia the free encyclopedia). For anime fans, the scores for series like One Piece have similarly become iconic for their emotional breadth.

What is the most popular soundtrack of all time?

• The Bodyguard (1992) – 45 million copies
• Saturday Night Fever (1977) – 15 million copies in US
• Titanic (1997) – 30 million copies worldwide

These numbers come from Wikipedia the free encyclopedia list of best-selling albums, which confirms The Bodyguard as the leader in film soundtrack sales.

What is Ennio Morricone’s most famous song?

Ennio Morricone’s “The Ecstasy of Gold” from The Good, the Bad and the Ugly is arguably his most sampled and covered piece. He also wrote “Gabriel’s Oboe” for The Mission.

The trade-off: Critics often debate whether “most famous” equals “most influential.” Star Wars reshaped how audiences experience epic adventure, while Morricone’s work redefined the western genre.

What is diegetic sound?

• Diegetic sound originates from within the film’s world
• Non-diegetic sound is added for the audience
• Film scores are almost always non-diegetic

Soundtrack Academy (film music education site) explains that soundtracks can include both diegetic source music (music characters hear, like a radio) and non-diegetic score. Diegetic sound is anything that characters can hear within the story – a car horn, a conversation, a band playing. Non-diegetic sound is added purely for the audience, such as background score or voice-over.

What is non-diegetic sound?

• Music that characters do not hear
• Includes the underscore of a film score
• Used to shape emotional response

Wikipedia (Wikipedia the free encyclopedia) defines non-diegetic sound as “sound that is not part of the story world.” Most film scores fall into this category: the orchestra swells as the hero triumphs, but no character in the movie notices the orchestra.

How does diegetic sound relate to film music?

• Diegetic music (e.g., a character singing) is sometimes included on a soundtrack album
• Non-diegetic score is the bulk of what we call “film music”

The distinction matters for composers: when scoring a scene where a character plays a piano, the piano music must be diegetic and therefore must appear to come from the instrument on screen. A film score composer, on the other hand, writes the non-diegetic cues that carry the emotional arc.

This duality is why a single “Bande-Son Originale” album can feel like a mixtape and a concert at the same time.

“The OQLF defines ‘bande originale de film’ as the soundtrack of a cinematographic production, noting that it may consist of original music or pre-existing music chosen for the film.”

– OQLF, Quebec government language authority

“A film score is original music written specifically for a film to support its story and emotion.”

– StudioBinder, film production resource

“A soundtrack album can contain only songs, but in some contexts it can also refer to the music associated with a film more broadly.”

– MasterClass, online learning platform

For anyone buying a film soundtrack album, the key is recognizing that “Bande-Son Originale” often means the commercial album, which may mix score and songs. Check the track listing to know what you are getting: if it lists pop artists and a composer, you are getting a hybrid. If it lists only the composer, it is likely a pure score recording. The choice between score and soundtrack is ultimately a choice between the director’s musical vision and the marketplace’s desire for hit songs. For music supervisors and collectors, the lesson is clear: read the label carefully, or ask for the “original score” if you want the instrumental-only experience.

For a deeper look at the distinction, see this detailed explanation of score vs soundtrack.

Frequently asked questions