背景音乐
Background music refers to a mode of musical performance in which the music is not intended to be a primary focus of potential listeners, but its content, character, and volume level are deliberately chosen to affect behavioral and emotional responses in humans such as concentration, relaxation, distraction, and excitement. Listeners are uniquely subject to background music with no control over its volume and content. The range of responses created are of great variety, and even opposite, depending on numerous factors such as, setting, culture, audience, and even time of day.