Singing harmony is not the same as singing a part in a choral group, where you know you're going to have to hit this note and then that note. There are nuances that change every day. Maybe today you have a slight cold or voice fatigue, or you've done something and there's a slight difference in your breathing.

You couldn't get me to go travel around and sit in a hotel room again. I have no interest in doing that. So everybody's happy. I am, at 74. Some people like doing it, but I never was much for that, anyway. It's a lot of work. So the only thing I miss about all of it is the camaraderie of the tour, but that doesn't offset the rest of it.

If you lose your concentration singing harmony, then it's lackluster and no fun to watch.

Phil Everly Quotes