Country music legend Kenny Rogers stated that he always sang better when he sang with someone else. When pressed to explain, he said (paraphrasing), “Say you were to go out and run the 100-meter dash. You would run as fast as you could. However, if they put someone on the track with you, someone who was a little bit faster, you would probably run harder to try and beat them. That is what always happened when I sang with someone else. For example, I would go in and put down my vocal track and think it was good. Then, Dolly Parton would go in and do her part, and it would be so much better than mine that I would go back and re-record my vocals. She would listen to mine and decide that she wanted to re-do hers, and she would get better. Of course, in a live performance, we would play off each other. I can sing alone, but everyone sings better in a duet!” It is tempting to live independently. It is common to think, “I do not...