Well, usually the composer watches with the director first and they talk in detail about what music/feeling the director wants/imagines. I saw a really great do

Well, usually the composer watches with the director first and they talk in detail about what music/feeling the director wants/imagines. I saw a really great documentary about this exact thing recently, Score: A Film Music Documentary (2016), with all-star cast. Shows a lot of composers in the act of writing for (mostly famous) movies, the initial talk-through, recording in the studio, talking about it - many great stories. A lot of John Williams etc. https://www.imdb.com/title/tt4207112/ https://www.imdb.com/title/tt4207112/