In this method we learn how SFS (String Fragment System) helps us tackle one of the most demanding challenges in improvisation, especially for guitar players: Improvising over chord and key changes.

  • Effortlessly switch to the appropriate Pentatonic Scale for each chord change.
  • Navigate and solo over complex music without using "box" shapes.
  • Move freely everywhere on the fretboard.
  • Lifetime Access (including future updates) on all your devices.


"When I first tried out Prokopis' system, to my amazement I 'immediately' began to map out the scale sequences with SFS. Prokopis is certainly a talented musician and teacher.”

Karl Sartin

“The very visual approach of SFS has already unlocked my mind to the fretboard. Having bought many many books and videos etc, I can safely say this is the very best system for me.”

Darren Wormald

Your Instructor


Prokopis Skordis
Prokopis Skordis

I am a music geek fascinated with learning new things, and improving my guitar skills. But I'm also very passionate about helping others do the same!

After studying in the Greek National Conservatory, and Berklee College of Music, I began performing and teaching privately in 2001.

Since then, I have been developing new methods for effective musical training. My mission with String Systems is to share them with the world :-)




Course Contents


  SFS Pentatonics 2 - Navigating Chord Changes
Available in days
days after you enroll
  Drills, Backing Tracks, and Extras
Available in days
days after you enroll

“…Thank you so much. I love your lessons, keep it up! You have a calling for this work.”

Eric Bang

Frequently Asked Questions


When does the course start and finish?
This is a completely self-paced online course. You get lifetime access on all your devices, and you decide when you start, when you finish, and how fast you want to go.
How long do I have access to the course?
After enrolling, you get unlimited access to this course (including future updates) for as long as you like - across any and all devices you own.
What if I am unhappy with the course?
You won't be 😀. But in the unlikely event that you are unsatisfied with your purchase, all EMP Courses come with a 30-day money back guarantee. Just contact us in the first 30 days and we will give you a full refund, no questions asked 👍.
Do you charge VAT or other taxes?
Our pricing is tax-inclusive. This means that no tax will be added at checkout. Any tax obligations will be calculated by our accounting system and remitted by String Systems to your local tax authorities, at no extra cost for you.
I have another question...
Feel free to contact me with any questions at [email protected]


“…When I first watched a few of your videos, I instantly knew there was something different about this system. I cannot believe all guitar players are not taught this way. It’s so simple and it makes sense so quickly.”

Jimm Panik