Are you a sucker for a sad song? “Greensleeves.” “Yesterday” by the Beatles. For some reason, we love a melancholy tune. But why? In this hour of To the Best of Our Knowledge, we’ll explore our love of sad music. We’ll look into the effects the minor third has on our brains and we’ll delve into the saddest music ever written: Barber’s Adagio for Strings.