I'll have to watch for the head position when a singer is pushing a note. I have never had a formal singing lesson. The day I knew I had a lot to learn form a professional vocal coach was the day I walked into a Fort Worth bar and heard a guy singing "Walk on by". I was marveling at his ability to hit the high notes without straining. At break I talked to him and he told me it was all about technique that he had learned from a vocal coach. He said, "If you can hit the note at all, you can learn to hit the note without straining". I never forgot that comment because he was proving it with every high note he hit.

"Imagination is more important than knowledge." - Albert Einstein