This sounds like a guitar harmonizer pedal, but it's not! (playing in 4ths on the guitar)

fretboard mapping scales Jul 15, 2025

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Today’s video is all about how to play harmonically using the interval of 4ths on guitar.

Practicing in intervals is a powerful way to improve your musicianship—and 4ths have a particularly modern, open, and unique sound, especially compared to more traditional harmonizations like 3rds or 6ths.

I love this sound, and I think you will too. It’s like using a guitar harmonizer pedal, except you’re actually just playing it!

As always, I’m not just giving you tips—I’m walking you through how to harmonize every major scale shape in 4ths, including:

  • How to cross strings smoothly (this is the tricky part!)
  • The exact fingerings to use
  • Full tab, notation, and fingerings shown clearly on screen

If you’ve been curious about playing in 4ths or want to explore a more contemporary harmonic sound, and sound like you’re using a guitar harmonizer pedal, then this lesson is definitely for you.

Thanks for watching! Feel free to leave a comment below the video on YouTube to say hi. :)
Cheers, 
~ Jared

🎼 Want to try it with other scales? FREE PDF: Click here to download the most important scale diagrams for guitar.

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