When a friend drops by unexpectedly, we invite them in and make them comfortable. Similarly, when a feeling of happiness overcomes us, we welcome it and hope it stays for a while. When a feeling of sadness overcomes us, we wish it gone, like it was a burn, or a bee sting. The salve that can possibly give us relief is a song that mimics the feeling. As the song echoes the sad feeling back to us, it’s like a friend telling us ‘I hear you’. It comforts and soothes us. In a little while, we want music that is quite the opposite. And so, opposites do attract, and balance is restored.