Why does music make us feel sad?

Photos by Zachary Smith & Tom Pumford, Unsplash

Why is Barber’s Adagio for Strings called the saddest piece of music ever? Why does it make us feel sad? How did Barber achieve that effect?

And when it’s remixed as a rave anthem, why does it not feel so sad any more? Have a listen to see what theories I come up with…