Fretfury Guitar Lessons

Do you wonder how the great fusion masters get their supernatural guitar sound?

Discover the ‘Sacred Geometry’ of the Fusion Guitar Gods

How one simple idea can transform your guitar sound from ordinary to unworldly almost overnight

No more wasted time on guess work and unproductive practice sessions

Because you’re here right now, I’m guessing

you want to blaze
mesmerizing guitar lines
and feel in control of your instrument?

Then you need to know how to play with your listener’s expectations
and keep them hanging from your every note.

Do you look up to certain ‘guitar heroes’ and wonder why they sound so amazing, yet you feel like an amateur when compared to them?

You’ve spent hours on your instrument …

… but feel as though you’re not getting closer to becoming the player you desire, and even wonder whether you have what it takes?

At Fretfury, we believe that

life is too short to spend it on things that won’t lead to your musical goals

… and those goals are important to a fulfilling life.

Now, I’m guessing this is probably not the first time you’ve looked for …

a solution to achieving that ‘fusion’ guitar sound.

And if you’ve failed at this in the past it’s not your fault.

There’s a lot of information out there, and it can be confusing.

Many times that information overload keeps you from success.

And that’s okay.

Silhouette of a man smashing a guitar

If you feel like you don’t have the ‘natural talent’ to get the results you crave, I want to put those fears to rest.

You CAN do this, you just need the right person to explain things to you.

You see, we’re constantly being told that in order to play fusion, we need to know all the modes and how to play them over different chords.

People love to over complicate things in order to feel superior, and it’s not that the guitarists preaching this are wrong but …

… it’s a huge amount of work and can seriously drain your motivation.

So that’s what we’re here for.

I know you have a dream to express yourself through guitar
and I want to show you how to get results fast.

Hi my name is Jonny Mac

For as long as I can remember I’ve been obsessed with music, and …

… in 1996 started my journey as a guitarist.

I’ve played in numerous bands, and studied music at both school and university. However, …

Image of Jonny Mac on stage

… in 2018 I was ready to walk away from the guitar after 22 years.

I’d dedicated my life to guitar and was a decent player, but I felt there was a huge piece of the puzzle missing.

All I ever wanted was the ability to express myself fluently through the guitar.

I had decent technique and a good knowledge of theory but …

… I couldn’t put it together in a meaningful way.

The bottom line

I felt like an amateur, and when I listened to my favorite players I felt so far from their level.

Maybe you can relate?

My playing lacked excitement, and I’d lost all hope at becoming a ‘real’ guitarist.

Image of Sergio R. Klein on stage

Luckily I was introduced to

Sergio R. Klein

… and he opened me up to a new world of musical possibility.

His playing blew my mind.

It sounded so fresh and unlike anything I’d heard before, and I wanted to know more about his approach to guitar.

So we started lessons
and one topic kept coming up;

Outside Harmony

Traditionally I’m not a ‘fusion’ guy, and was originally a fan of Sergio’s metal playing, so …

… I was skeptical of the crazy harmony lessons he was throwing at me.

That was until he explained the true purpose of learning licks (more on this later), and how to use them to integrate new knowledge into your playing.

With just one lick and some guidance
I literally transformed my playing overnight.

That’s not to say I’d mastered the material, but …

… I saw real progress, giving me the confidence to continue on my path.

At first I didn’t think
outside harmony would help me

My favorite guitarists are Marty Friedman and Dimebag Darrell

… and they play metal, not jazz fusion.

However I did recall a Guitar World interview, where Marty talked about playing ‘outside the key’.

And when I thought about it, Dimebag would also play symmetric, ‘outside’ patterns.

But how do you play outside the key without it turning into a complete mess?

Well, perhaps Marty can clear that up.

Marty Friedman playing guitar on stage

Playing outside the key is like going into a bad neighborhood …

… you hang there too long you’re gonna get shot. If you slide in and out of there you’re a cool guy, …

… but if you stay there too long and get shot, you’re definitely not cool.

Marty Friedman

Ok Marty, that’s cool, …

… I don’t want to get shot either, but …

… how do I even slide in and out of these neighborhoods?

The real answer lies in the

Intervallic Groupings

Sure, you could learn some ‘half-whole diminished’ or ‘melodic minor’ scale fingerings. However …

… they’re probably going to sound forced, and it’s easy to get lost.

But intervallic groupings are …

… easy-to-use, melodic scale fragments you can seamlessly apply to your current knowledge.


Outside Fusion Phrasing

If you want to slide in and out of the bad neighborhoods without getting shot (even if you’re a complete newbie at ‘outside harmony’), follow these 3 steps:

Green 3-step-process arrow

Learn 1 lick
and map its
‘intervallic grouping’

Blue 3-step-process arrow

Integrate this with the
scales and arpeggios
you already know

Red 3-step-process arrow

Repeat steps 1 and 2
to expand your
musical vocabulary


frustrated guitarists who

Young man playing guitar outside

I have a message for you (a message I wish I could’ve given myself 20 years ago):

If you feel your guitar playing lacks excitement, then …

rip into some outside licks
and spice things up


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Your guitar teacher

Sergio Klein in the studio

… Sergio R. Klein is a professional guitar player, in-demand sideman, international performer and instructor, composer, and author currently based in Berlin, Germany.

He began his studies at age seven with classical piano training at the Conservatory in his native Chile. He gave his first live performances, including music from J.S. Bach, W.A. Mozart and Ludwig Van Beethoven, when he was just eight years old.

Having laid a solid musical foundation in his formative years, Sergio started to teach himself guitar at age 12 and his progress soared exponentially. So much so, that by the time he was 16, he was filling in for his teacher at the local university.

Sergio has dedicated his life to guitar and the study of music. He has earned a bachelor of music (B. Mus.) in ‘music performance’ (contemporary styles), majoring in ‘guitar performance’ from Instituto Profesional Escuela Moderna De Musica (Modern School of Music College) in Santiago de Chile. He is also the author of How to Master Chord Changes and Harmony, and is a fully-endorsed artist with Aristedes Instruments, Skervesen Guitars, and Positive Grid.

Utilising his rhythmic, Latin American roots, Sergio blends elements from different music styles to forge a unique sound. He’s played as a solo, and session guitarist for different Jazz, Latin, Prog, and Metal projects, and is a member of South American thrash legends (and childhood heroes), Criminal, signed to Metal Blade Records.

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How will

Outside Fusion Phrasing

transform your guitar playing?

Scott Henderson playing guitar
Frank Cifarelli testimonial image

Sergio was my first real guitar teacher, and one of the most amazing players I’ve ever had the good fortune to study with. And so knowledgeable. I can’t recommend him enough as a teacher.

Frank Cifarelli – New York, USA

Oliver Fleischer testimonial image

Sergio has had a huge influence on my taste in music, my musical knowledge, and of course, the way how I play guitar. I always fell better after a lesson, he is a big inspiration to me.

Oliver Fleischer – Berlin, Germany

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I’ve taken lessons with Sergio for around 3 years. I especially like that he tries to overcome even your minor flaws in technique with useful exercises, so you can overcome them finally.

Pujan Klose – Berlin, Germany

Once I understood

the true purpose of learning licks

I realized that:

Tim Chilman playing guitar on stage
Tim Chilman

Before meeting Sergio I’d played guitar for 22 years.

I was a decent song writer and rhythm player, but …

… when it came to lead, I felt like a complete novice.

I’d jam with our band, and my friend Tim could play so freely.

More than anything,
I wanted to play with that same freedom.

I had a good grasp of scales and theory, but my solos sounded lame.

I felt so inadequate, …

… I’d avoid jamming and cut straight to rehearsal.

I asked Tim how he learned to play, and he told me he learned licks.

However, when I tried to incorporate licks into my solos, they sounded forced.

When I started lessons with Sergio, he compared learning licks to reading.

Image of Sergio R. Klein on stage

If you’re explaining something you’ve read, you don’t repeat the information word for word.

You interpret the meaning and repeat it your own way, using your own vocabulary.

You’ll rarely say the same story twice, and can use as many, or as few words as you need.

The core idea is always the same.

Sergio R. Klein

My new goal wasn’t to string licks together note for note, but to …

understand a lick’s core idea,
or as Sergio calls it:

a lick’s ‘intervallic grouping’

and add this to my musical vocabulary.

I only knew a handful of licks, so felt like I had a long way to catch up.

But, once I put this concept to work, I was able to do much more than play a single lick.

I could use its intervallic grouping to
create multiple licks that work seamlessly with each other.

However, my real transformation isn’t the licks, or even the new harmony I can integrate, but …

… the realization I can achieve noticeable results, even if I lack natural talent.

And best of all …

… once I learned the lick’s intervallic grouping and how it related to the scales and arpeggios I already knew, I was able to integrate it into my playing overnight.

Obviously, any new idea will take time to master, but …

it’s possible to see results quickly,
whether YOU think you have talent or not.

Give a man a fish, and you feed him for a day; …

… show him how to catch fish, and you feed him for a lifetime.

Old School Proverb

If you’ve

tried to improve

your lead guitar skills, yet:

Close up of Sergio fretting guitar

… then, using a lick’s intervallic grouping as a spring board for exploration is an excellent solution.

So, now you know how to use licks as a starting point to …

… build your own musical vocabulary.

Pretty cool right?

Let me ask you a question

If you could do the following:

  1. Learn 1 lick and map its intervallic grouping
  2. Integrate this with the scales and arpeggios you already know
  3. Repeat steps 1 and 2 to expand your musical vocabulary

… do you think you could express yourself and say more with your guitar?

Are you excited about what we just covered?
Are you feeling a little overwhelmed because we’ve covered so much?

Mind blown emoji

Then if it’s okay with you, I’d like to spend 10 minutes going over …

… a very special offer I created to help you build your own fusion guitar vocabulary?

It’s totally fine if you don’t want to know this stuff. I already know it.

This isn’t about me; this is for you.

Is it cool if I spend 10 minutes
and show how it can change your
approach to guitar?

Outside Fusion Phrasing

is everything you need

to start building your own
fusion guitar vocabulary

2.5 Hours of In-depth
Video Lessons

Outside Fusion Phrasing device image

Inspiration and motivation can be hard to summon.

With 11 video lessons each based on different licks, you’ll:

Even if you don’t follow along with Sergio in the videos, the lessons alone are inspirational and will motivate you to take action.

40-Page Workbook

Outside Fusion Phrasing workbook image

Sometimes it can be hard following along to video lessons.

The Outside Fusion Phrasing workbook provides …

… detailed explanations of the theory along with fretboard diagrams, so you can get the most from the licks in this course.

Even if you don’t care for the theory, the diagrams are super valuable on their own.

60+ Exercises

Outside Fusion Phrasing tablature image

Knowledge on its own won’t get results. You need to put it into practice.

With 60+ exercises (in Guitar Pro and PDF formats) you’ll:

These exercises are designed for musical integration, so you don’t need to worry about becoming bored.

How will the course be delivered?

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Online Members Platform

You get your own secure login to my online member’s platform.

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Stream On Any Device

The videos can be streamed from any device, anywhere, anytime. All you need is an internet connection.

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Download Tabs & PDFs

You can download and print the tabs and PDF documents as many times as you like.


Outside Fusion Phrasing

video course includes:

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The BAD NEWS is:

Outside Fusion Phrasing

Is NOT for Everyone

Sorry guys — maybe next time.


It's SPECIALLY designed for

open-minded, motivated guitarists

… no matter which style you play.

It works perfectly for:

Silhouette of a guitarist on stage

You might be thinking

“Outside harmony sounds too complicated.
I don’t know enough theory.”

Let me ask you a question:

Did you learn grammar before you started speaking?

I’m guessing no.

You started speaking through imitation, and over time grew your vocabulary and the ability to create complex sentences.

Only later did you start learning grammar to understand the mechanics of language.

Many people only learn a small amount of grammar, yet speak fluently.

Building your own musical language is exactly the same.

Take one lick (word) and learn to use it.

It’s that simple!

If you want to learn theory (grammar), then you’ll have a much better understanding of the musical language, but …

… a lack of theory shouldn’t stop you from expressing yourself.

Here’s EVERYTHING you need to start building

your own fusion
guitar vocabulary

right now

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Total Value: $201

$ Today ?

Claim your copy TODAY

and get these FREE, bonus

Quality Backing Tracks

Outside Fusion Phrasing backing track images

Integrating what we learn into real music can be challenging.

Sergio created these backing tracks especially for Outside Fusion Phrasing, …

… so you can:

Don’t wait until you feel you’re ready.

Start integrating your new skills straight away.

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Here’s EVERYTHING you need to start building

your own fusion
guitar vocabulary

right now

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Total Value: $218

$ Today ?


I’m NOT going to charge you $2​18

But If I DID charge you $218, and if just 1 lick opened your ears to new possibilities, …

… would it be worth it to you?

Guitarist silhouette

If all this method did was

… show you how to use licks to build your own musical vocabulary.

Would it be worth $2​18?

If all it did was

… give you confidence in your ability to improve on guitar.

Would it be worth $2​18?

Silhouette of guitarist
Guitar player silhouette

And if all it did was

… prove you can implement new ideas quickly.

Would it be worth it?

If you could express yourself more fluently on guitar,
what would it be worth to you?

How much would you pay to have that ability?

You can probably see why people would gladly pay $218, because …

… it’s not a cost. It’s an INVESTMENT.

And even at $218 it’s a great deal.

But because you’ve committed your time today, …

… I’m going to give you a very special offer.

For a limited time,
you can get Outside Fusion Phrasing

for only $87

Outside Fusion Phrasing product image

Total Value: $218

$87 Today

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If you were to hire Sergio to teach you this stuff, it could cost $500.

But because you’re learning how to do it yourself AND I’m giving you all the resources to make it happen, …

… you only pay $87.

So at this point

you have two choices

Choice #1 is to do nothing.

If you do nothing, what will you get? Nothing.

Or you can choose to take a leap of faith.

Just test it out to see if it’ll work for you.

The Fretfury
100% money back guarantee

Purchase with confidence … it’s risk free!

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Look. Let’s be honest. You don’t know me (probably), I don’t know you.

Why should you trust me when there’s a high chance you have bought a course before from somebody else (who you didn’t know at that time) and it flopped, right?

I decided to take all the risks from your shoulders and give you full 30 days to go through the program. During this time you can decide if it’s worth the price. If not just send us an email to and we’ll send you a refund right away!

The real question is this:

Is it worth gambling a few minutes of your time to check this out? 

Even if it only does HALF of what I’ve claimed today,
then one lick can could help unlock new potential.

Here’s EVERYTHING you need to start building

your own fusion
guitar vocabulary

right now

Outside Fusion Phrasing product image

Total Value: $218

$87 Today

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Privacy: We will not share or trade online information that you provide us (including e-mail addresses).
Security: All personal information you submit is encrypted and 100% secure.
All prices in USD

Think how much it’s costing you every day
you don’t take control of …

your musical destiny

“So are you telling me I don’t need theory at all to learn fusion guitar, that I should just learn licks?”

No, not at all.

In order to truly master fusion guitar, then …

… understanding the harmony on a deeper level is necessary.

What I’m trying to tell you is this:

You DON’T need to spend years
learning advanced jazz harmony to

start playing
fusion guitar

You can use licks and their intervallic groupings
to implement new ideas quickly.

And (if you’re interested) you can learn the theory afterwards.

But for now …

Start implementing. Start taking action. Start playing music.

Intervallic groupings are your SHORTCUT to help implement advanced concepts quickly.

The licks in this course will help you build a fusion guitar vocabulary …

But, please, don’t give up!

Try to use intervallic groupings.

Take control of your musical choices

The best time to plant a tree was 20 years ago.

The second best time is NOW.

Chinese Proverb

Frequently Asked Questions

After purchasing, you’ll receive instructions on how to set up an account in the Fretfury member’s area the ‘dojo’. You’ll be able to access this and all future products you purchase through the dojo.

If you’re not satisfied with this product for any reason, then please send an email to within 30 days of purchasing, and you’ll receive a full refund.

No, this course isn’t suitable for beginners. To get the most from this course, you want to have at least a good understanding of the core pentatonic scale patterns, and the ability to read tab and fretboard diagrams.

No worries, you don’t need to play fusion music to get value from this course. The ideas from this can be applied to other genres i.e. metal, blues, rock, pop. The goal of this course is to expand your musical vocabulary, and to know when and how to use certain sounds to get your point across.

If you’re still on the fence

now is the time to CLICK THE BUTTON below
and get started

Remember there is no risk, and we have a 100% money-back guarantee.

But the only way for you to know if this is right for you is to get started right now.

Here’s EVERYTHING you need to start building

your own fusion
guitar vocabulary

right now

Outside Fusion Phrasing product image

Total Value: $218

$87 Today

Secure checkout badge
Money back guaranteed seal
Secure payments with Stripe banner

Privacy: We will not share or trade online information that you provide us (including e-mail addresses).
Security: All personal information you submit is encrypted and 100% secure.
All prices in USD