the.com/soundtrack

The music that tells you how to feel before you've decided for yourself.

means The music and audio recorded to accompany a film, show, or game — or more loosely, the songs that define a particular time or experience in your life.

from Born in the early days of talking pictures, when film reels gained a physical strip running alongside the images — literally a 'track' of 'sound' etched onto the film's edge, separate from the picture track. The term stayed literal (an actual stripe on celluloid) long before it drifted into metaphor, becoming the shorthand for 'the songs of your life' or 'the vibe of this moment.'

origin
Term predates film, from physical strip on celluloid
psychology
Can make mediocre scenes feel profound, or vice versa
trick
Silence before a swell manipulates you more than volume
irony
Best scores go unnoticed while doing the most work
the.com · every word