Featuring original music written and composed by Nicholas Britell, the film marked his second collaboration with Jenkins after the Academy Award-winning Moonlight (2016).

The score album was released on November 9, 2018, by Lakeshore Records[2][3] and received positive response from critics, praising the instrumentation, composition and musical soundscape.

When the music for the film was first written, Jenkins said that he wanted the sounds of brass and horns, that was the "first intuitive idea of a feeling".

He had the strings and brass were included to write the score in a classical way, but at times, jazz harmonies as included in the score, as "music is incredibly fluid space, and sometimes the labels create boundaries that aren’t really there", thereby enticing to blend multiple genres in several ways, to create an atmospheric sounding.

At the same time, I was exploring these colors with a mixture of French horn, and trumpet and flugelhorn, even [with regard to] where they sit in the register.

It’s not sweeping romance in the John Barry sense – it’s much smaller-scale in terms of the orchestral forces, most obviously – and while you could say it’s somewhat repetitive on the album, the darker moments do provide the offset that is so often so powerful in strengthening the impact of the emotional material.

But there is still an inexplicable something about the score which keeps It from clicking, whether it’s the repetitiveness, or the lack of development, or the way in which so many of the musical ideas seem to clash, to the emotional detriment of the whole experience.