Instead of art I have taught philosophy. Though technique for me is a big word, I never have taught how to paint. All my doing was to make people to see.
When you are making a record and if you spend too much time over it, you have to record it a tone lower or cut the tones lower because you can't reach some of the notes, I find this. But when you go on stage, you have to put the key up and it really changes the whole thing.
I love rehearsing because in rehearsals there are no mistakes, nothing is wrong, some things apply or lead you to focus on the character and the things that don't apply are equally valuable because they lead you to towards what does.