I listen to vocal music, but I never write with it in the background. If I want to be inspired by a vocal track, I play it BEFORE I begin writing.

Two recommendations not from film / soundtracks:

Olafur Arnalds, e.g his Living Room Songs: https://youtu.be/s6v3Qaheqcg

Wim Mertens (who has also composed soundtracks), fashions his own personal language for vocal tracks, e.g. https://youtu.be/WkQ5K9ZFeK8 ); you can create your own words when you listen to the music.