Music is often better than speech at conveying and understanding emotion, because music has a kind of openness and ambiguity to it. Words, on the other hand, tend to put things into boxes. If I say, I’m happy, but also a bit sad, nervous, winsome, and tired, those words are still boxes. But if I play you a passage of music — maybe something by Elgar — you might think, Yes, that’s exactly how I feel.