Singing is an athletic event that utilizes person's mental and physical capabilities to express ehat is in the music. One takes lessons to establisk the mecesarry technique to coordinate all of these muscles and thought processes. This is important because the voice is an abstract instrument that requires metaphors to help tear down blocks or unlock doors that may be standing in your way to better singing. Muscles that get their cues from your brain control the voice. Lastly, music was created to be performed.
Vocal music needs to seem spotaneous and sincere, coming from the heart.
We need to be free enough to access this emotion without the emotion taking us over. The performer needs as much training as a medical doctor does. Also like a medical doctor you are on call 24 hours a day. Thinking about singing should encompass everything in your life. I mean this to compliment your life, not take it over.