Emily's OST

Spitfire Audio shares plenty of information on Abel Korzeniowski's score for Emily:

A sixteen minutes behind-the-score video with the composer himself:

An interview with the composer:

“Emily Brontë, in combination with Emma Mackey’s performance, creates such a vibrant portrayal,” Korzeniowski explains. “We couldn’t tell this story by having her solely constrained to her natural surroundings. The whole point is that Emily’s internal life and her imagination was so much larger than everything around her. Music was a natural way of allowing the audience to feel how wild she was inside. She was a nonconformist and ahead of her time.” (Sean Wilson)

Another interview with the film director, Frances O'Connor, talking about the soundtrack: 

Joe Williams: What did the discussions between you Abel on the score for Emily look like? 

F.O'C.: We centred the score around the idea of experience, around the idea of her experience so the music wasn’t prescriptive, it didn’t tell the audience what to feel, it just shadowed what she was going through, in a way. For example, when Emily and Weightman have that moment where they meet in the college, and make love for the first time, we could have done a very romantic score that was kind of violins going crazy. Instead we did something very much about vibrations, this feeling of intoxication, so things like that are really fun to play with too, when you say "Let’s do something different in this moment." Not for the sake of difference, but so they reflect what’s going on in the piece.

And, of course, the complete soundtrack.