die Filmmusik
film music
The music that is composed or compiled specifically for a film in order to underscore the plot and atmosphere.
Die Filmmusik von 'Star Wars' ist weltberühmt.
The film music from 'Star Wars' is world-famous.

film music
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film music
The music that is composed or compiled specifically for a film in order to underscore the plot and atmosphere.
Die Filmmusik von 'Star Wars' ist weltberühmt.
The film music from 'Star Wars' is world-famous.

The word 'Filmmusik' (film music) is a very logical compound made from 'der Film' (the film) and 'die Musik' (the music). So it literally refers to music that belongs to a film.
Gute Filmmusik kann eine Szene viel emotionaler machen.
Good film music can make a scene much more emotional.
To show the connection, you use 'Filmmusik von' (film music by) for the composer and 'Filmmusik zu' (film music for/from) for the film. This distinction is very useful.
Die Filmmusik von Hans Zimmer ist oft sehr kraftvoll.
The film music by Hans Zimmer is often very powerful.
Certain verbs are often used in connection with 'Filmmusik' (film music). Composers 'komponieren' (compose) or 'schreiben' (write) it, and the audience 'hört' (hears/listens to) or 'genießt' (enjoys) it.
John Williams hat die Filmmusik für viele berühmte Blockbuster komponiert.
John Williams composed the film music for many famous blockbusters.
soundtrack
'der Soundtrack' and 'die Filmmusik' overlap when it comes to music in a film. 'die Filmmusik' is the normal German word for music that accompanies a film and supports its mood. 'der Soundtrack' can mean the same thing, but it is broader: it can also refer to songs from the film, music from series or video games, and the released album. The words are easy to confuse because you often hear both in connection with films. If you are only talking about music in the film, 'Filmmusik' is very natural; if you mean the album or the whole selection of music, 'Soundtrack' fits better.

Die Filmmusik passt sehr gut zu den ruhigen Bildern am Ende.
The film music fits the quiet images at the end very well.
Hast du den Soundtrack zur Serie schon gehört?
Have you already listened to the soundtrack to the series?