To track how much music people listened to at home (on average, four and a half hours a day) and what happened while they listened, they rigged thirty homes with Sonos speakers, Apple watches, Nest cams and iBeacons. When tunes were playing, the distance between housemates decreased by 12 percent, while chances of cooking together increased by 33 percent, laughing together by 15 percent, inviting other people over by 85 percent, saying “I love you” by 18 percent, and, most tellingly, having sex by 37 percent.
