mood music
US /ˈmuːd ˌmjuː.zɪk/
UK /ˈmuːd ˌmjuː.zɪk/

1.
music intended to create a particular emotional atmosphere or mood, often used as background music in films, restaurants, or other settings
:
•
The restaurant played soft mood music to enhance the dining experience.
•
The film used dramatic mood music to build suspense.