The under-vowel/over-vowel setup, the tongue and space adjustments, and the 'butter' on top that make big high notes land the same way every time.

Aimee Geddes calls them money notes: the big, sustained, dramatic high notes students beg to learn and then panic on. In this live masterclass she stands a room of teachers up for her lead-in warm-ups, then coaches three volunteer singers on real repertoire. You will see her under-vowel/over-vowel framework in action, the "hug your tonsils" cue for narrowing the vocal tract, why going taller beats going wider, when to add a lower larynx and more mass, and why she lets acoustics do the work instead of muscle. Best of all, she makes every fix repeat three times, because a note you hit once is a fluke, not a skill.