noun
mood music
Background music designed to create a particular atmosphere, often in restaurants, lounges, or elevators.
レストランでムード音楽が流れていた。
Mood music was playing in the restaurant.
BGM is a broader term for any background music, while ムード音楽 specifically emphasizes creating a mood or atmosphere.
Wasei-eigo (Japanese-made English) combining 'mood' and 'music'.