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Exclusive Upgrade • For Foundation Students Only

You’ve Mastered the Foundation.
Now It’s Time to Go Pro.

The same system that got my students on Broadway and on national tours. Now the complete online course, with advanced technique, live coaching, and lifetime support.

17In-Depth Lessons
★★★★★Broadway & Touring Students
38Years of Method
LiveMonthly Coaching Calls

You completed the 7-day foundation system. Your posture, breathing mechanics, and throat are solid. You understand why things work. You’re no longer confused about the fundamentals.

But There’s a Difference Between Understanding the Foundation… and Performing Like a Professional.

The singers on Broadway. The ones touring nationally, performing 8 shows a week. They didn’t stop at the foundations. They went deeper. They mastered:

  • Advanced vocal technique for stamina and power.
  • Performance psychology that holds under extreme pressure.
  • Personalised strategies for their unique voice.
  • Recovery protocols for vocal longevity.
  • The mental game that separates professionals from hobbyists.

This is that next level. This is where good singers find their full potential and become great.

The Gap

What Separates Foundation From Mastery

The Foundation gets you stable. Complete Mastery gets you exceptional.

The Foundation
$47
  • Core posture, breathing mechanics, and throat
  • Basic performance psychology
  • An introduction to the science
  • Self-guided learning
Complete Mastery
$997
  • All 17 lessons of the complete system
  • Advanced technique for range, stamina, and power
  • Performance psychology mastery for high-stakes moments
  • Learn to control the interfering emotions that wreck a voice
  • A strong, enduring voice with no cracks or breaks
  • Predictable high notes and low notes
  • The complete MRI and fibre-optic science library
  • Live monthly group coaching with me
Let Me Be Direct

This Is for Serious Singers Only

The foundation system is perfect if you just want reliable vocal control for casual performance. But this program is for singers and professionals who are serious about going pro.

  • You’re preparing for professional auditions (Broadway, national tours, recording contracts).
  • You’re preparing to get up in front of an audience.
  • You’re already performing but want to level up your stamina and technique.
  • You’re tired of generic advice and want concrete strategies tailored to your voice.
  • You want the same training my Broadway and professional students received.
  • You’re ready to invest in your voice as your career.

If that’s you, keep reading.

What You Get

The Complete System

Phase 1

Advanced Vocal Technique

Lessons 1 to 12, plus 14 to 16 • Weeks 1 to 4

Range Expansion & Control

Safely expand your range and access your full voice without strain. Mix-voice mastery for seamless transitions, with no breaks or cracks, shown through MRI and fibre-optic analysis of what actually happens.

Power, Projection & Endurance

Increase volume without forcing. Resonance strategies for filling large spaces, the science of why some voices carry, and how to hold power and endurance through long performances.

Your Signature Sound

Emotional delivery without vocal sacrifice, genre-specific technique (musical theatre, pop, rock, opera, contemporary), and how to make your voice your signature sound.

Stamina & Vocal Health Lessons 14 to 16

The exact protocols my touring students use for 8-show weeks, how to recover from vocal fatigue fast, and the hydration, nutrition, and lifestyle factors backed by research. Plus advanced dynamics and phrasing.

Phase 2

Performance Psychology Mastery

Lesson 13 • Weeks 5 to 6

High-Stakes Performance Protocol

My complete system for controlling interfering emotions, the one my Broadway and professional students use. How to recognise when emotions are interfering and stop them, how to perform your best when it matters most, and the neuroscience of peak performance states.

Mental Resilience & Recovery

Handling rejection, bad reviews, and setbacks. Not personalising criticism, the psychology of consistent excellence, and how to bounce back from “off” performances with unshakeable confidence.

The Professional Mindset

How to show up like a pro before you’ve “made it”, managing performance anxiety long term, the mental game of auditions and competitions, and career sustainability strategies.

Phase 3

The Science Library & Live Coaching

Ongoing access

Complete MRI Science Library

Full MRI imaging and video sequences of optimal vocal production woven through every lesson, comparative analysis of misconceptions versus facts, visual proof of what “support” actually looks like, and research citations for every method taught.

Complete Fibre-Optic Footage Library

Real-time laryngoscopy of proper vocal fold closure, what happens during tension, strain, and fatigue, and a visual comparison of healthy versus unhealthy technique across different vocal styles.

Monthly Group Coaching Calls (Live)

Live Q&A on your specific challenges, direct access to 38 years of coaching experience, technique demonstrations and breakdowns, and help identifying your specific technical challenges.

Proof, Not Promises

Don’t Take My Word For It

This system has transformed the lives of singers, actors, musicians, absolute beginners, and many others around the world. Tap any video to hear it in their own voice.

Proof, Not Promises

The Careers Built On This System

Broadway actors, touring performers, teachers, and professionals who need their voice to hold up when it counts.

Vocal Mastery students
★★★★★ Rated 4.9 / 5.0 by 3,000+ students worldwide
★★★★★

“I wouldn’t have been able to project on a Broadway stage, which I had to do a year later, if it weren’t for the Commands.”

Noah Robbins
Noah Robbins
TV / Film / Broadway Actor
★★★★★

“The Commands outline the most straightforward method for protecting, strengthening, and maintaining your voice so you won’t have to worry about it again.”

Alan Paul
Alan Paul
Artistic Director, Barrington Stage Company
★★★★★

“I had crippling anxiety surrounding both auditions and performing. Performance Mode was the secret ingredient I needed to enjoy performing again. It gave me the ability to keep my nerves in check.”

Rajni Rao
Rajni Rao
Singer & Math Tutor
★★★★★

“Before learning from Chrissellene, I tried everything I knew in my training to correct the issues, and nothing was working. Today I have a full studio where I teach Performance Mode and the 7 Commands.”

Melody Stevens
Melody Stevens
Singer, Teacher, Musical Theatre Director
★★★★★

“Chrissellene’s techniques have helped me not only as a singer in my professional life, but also as a wife and mom in my personal life. I have performed more and gained more confidence as a person and performer.”

Mara Adler-O'Kelly
Mara Adler-O’Kelly
Lyric Soprano, Vocalist & Educator
★★★★★

“The first smart thing I did concerning my vocal training was realizing I was missing something and needed help. If you are a human on planet earth who has any kind of emotional or artistic needs, you will only benefit from Performance Mode and the Commands.”

Emma Kingsley
Emma Kingsley
Singer, Actor, Lady Farmer Founder
★★★★★

“When I first met Chrissellene, I was curious. I am not a singer, I’m an international lawyer. In just a few lessons, I transformed my nasal sound and confidence. Performance Mode and the Commands have changed my life!”

Paula Ruiz
Paula Ruiz
International Attorney / Speaker & Presenter
The Investment & What It Replaces

Add Complete Mastery to Your Order

One click. Your payment details are already on file, so there’s nothing to re-enter.

Vocal Mastery: The Complete System on laptop and mobile
Private vocal coaching at my level$200 to $300 / session
To get what’s in this program, you’d need 30 to 40 sessions$6,000 to $12,000
Today, the complete system$997

Payment Plan

Spread the cost. Same full access from day one.

3 × $349

Per month for 3 months • +tax

  • All 17 lessons + complete science library
  • Live monthly group coaching calls
  • Lifetime access + all future updates
  • 90-day transformation guarantee
Add the 3-Payment Plan3 payments of $349 • Full access day 1

First payment today, then monthly

Accepted payments Secure one-click checkout • SSL encrypted
No thanks, I’ll stay at the foundation level for now.

90-Day Transformation Guarantee

Go through the complete program. Apply the advanced techniques. Show up to the coaching calls. If after 90 days you don’t feel more advanced vocal control, more confidence in high-pressure situations, and more equipped to pursue a professional career, I’ll refund every penny. I’ve been doing this for 38 years. My students are on Broadway and they are professionals. This system works if you have the discipline to work it. If you show up and it doesn’t transform your voice, I haven’t earned your investment.

What to Expect

Your Transformation Timeline

Weeks 1-4

Advanced Technique

  • Your range expands safely
  • Stamina increases noticeably
  • You understand your voice at a deeper level
Weeks 5-8

Performance Mastery

  • Nerves stop hijacking your performances
  • You develop consistent control of emotions
  • Your confidence becomes unshakeable
Weeks 9-12

Professional Integration

  • You’re singing like a pro
  • Recovery is faster after heavy use
  • No more hoarseness or tension
Month 4+

Career Sustainability

  • Handle 8-show weeks without fatigue
  • Auditions feel exciting, not terrifying
  • You know how to protect your voice for life
Who This Isn’t For
  • Casual singers who just want to sound better in the shower.
  • People looking for quick hacks without doing the work.
  • Anyone not willing to practise consistently.
  • Singers who haven’t mastered the foundations yet.
  • People who want results without investing in themselves.

If that’s you, stick with the $47 foundation course. Seriously.

Who This Is For
  • Aspiring professional singers preparing for auditions.
  • Professionals and speakers preparing to get in front of an audience.
  • Executives and businesspeople who need to command the room.
  • Musical theatre performers going for Broadway or touring roles.
  • Working singers who want to level up their technique.
  • Anyone serious about building a singing career.
  • Foundation students ready for advanced training.

If that’s you, this is exactly what you need.

Medical Endorsement

Backed by Science. Endorsed by Physicians.

Dr. Blair Eig
“Voice and Science is the bridge Chrissellene has built. Most vocal training provided by professional voice teachers at this time is based on timeworn methods that may have little relationship to actual human physiology. As a physician and a singer, I am quite impressed with the extensive work Ms. Petropoulos has undertaken to develop and support her theories of vocal training. I have seen a marked improvement in many singers she has coached.”
Dr. Blair Eig
M.D., M.B.A., M.A. • Physician & Singer
Only You Know Which Is Right

Two Paths Forward

Path 1: Stay at the Foundation
  • You have the basics.
  • Your voice is more reliable than before.
  • You’re happy with “pretty good”.
  • That’s totally fine.
Path 2: Go Pro
  • You master the advanced technique.
  • You master the interfering emotions that wreak havoc on your voice.
  • You train like my Broadway and professional students trained.
  • You build a career-level voice and confidence.
Questions

Frequently Asked Questions

If you’ve completed the foundation and practised the basics, yes. This picks up and reinforces exactly where that left off.
Lifetime. Forever. All future updates included.
Payment plans are available: 3 payments of $349.
3 to 5 hours of practice for best results, but the program is self-paced.
All genres. The technique applies to any professional singing.
Yes. There’s a live Q&A Zoom class once a month where you can bring your specific challenges.
Final Thoughts From 38 Years of Teaching

You Have the Foundation. Are You Serious About Going Pro?

The students who “made it”, who are now on Broadway, on tour, in recording studios, weren’t necessarily the most talented when they started. They were the ones who invested in mastery, not just basics. They went deeper. And now they’re professionals.

Only 20 students per quarter, so I can personally review everyone’s progress.
Chrissellene Petropoulos

P.S. Your voice will thank you.

Once the 20 quarterly spots fill, there’s a waitlist. If you’re serious about going pro, this is the moment. I’ll see you inside.

Chrissellene

Upgrade to Complete Mastery
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