Music vs. Sound Design
With sound design being a massively important factor on movies for the last 10-20 years, the way to handle this from the music side has also changed quite a bit. While in earlier times, audio tracks of movies were way less occupied and composers didn’t need to worry most of the time how their music is going to cut through, by now it has become on most film genres more or less a constant battle about how much space will be left for the music, especially on action sequences. If possible get in touch with the sound designer of the movie and have constant dialogue with him/her to make sure both elements work together in problematic sequences. The important part here is to not start a dialogue with the attitude of him/her being your enemy and you need to fight for your right to get space but rather try to work in the mutual interest of making the sound track as good as possible, which also means to make compromises.