How To Sing High Notes: Open Your Mouth?

Q: I’ve been told to open my mouth more in order to sing high notes. Should I do this?

A: “Open your mouth” is a common instruction. “Darken the vowel”, “push from your stomach” , etc are other common "tricks". All these “tricks” do work in the same limiting way as if you were to do a biceps curl using your back and shoulders. You can actually lift more when doing so. But how much does it develop your biceps? When we discover how to sing high notes without this kind of external help, we also become freer as artists. Now we can express truthfully and freely.