Watch Richard Lissemore coach two volunteer sopranos through the second passaggio with real-time spectrum analysis showing exactly when the turnover happens.

This is the science put to work. Richard Lissemore takes two volunteer singers he has never met, puts them in front of a live spectrum display, and coaches them through the upper female turnover while you watch the harmonics shift on screen. You'll see why the E vowel and OO make the change easy and AH makes it hard, why chromatic scales are the toughest and most useful drill, and why the change should happen around E — not G, as commonly taught. Lissemore works vibrato consistency, energy versus volume, portamento, and consonant cues like G and K, then shows what happens when a singer sees her own spectrum as biofeedback.