This hack makes learning the modes ridiculously easy

This was the 8th Fret Science YouTube video, originally published on March 2, 2023. With the possible exception of Pentatonic Gear Shifts, I believe the core idea presented in this video is my biggest contribution to the world of guitar players. As of December 2025, this video has been viewed 66k times, making it the 13th-most-popular Fret Science video.

Original description: If you already know the pentatonic scale anywhere on the fretboard, you can instantly access the major scale modes by understanding how the modes relate to the pentatonic scale and to each other. Once you see it, you can't unsee it, and it boggles my mind that it's not always taught this way.

The easiest way to play the modes is hidden in plain sight

Six of the seven modes contain a pentatonic scale rooted on the first scale degree. The three major modes (Lydian, Ionian, and Mixolydian) contain the major pentatonic scale, and the three minor modes (Dorian, Aeolian, and Phrygian) contain the minor pentatonic scale. The Locrian mode is not based on a minor or major pentatonic scale, so this technique doesn’t work for it.

Each of the five pentatonic forms is made up of rectangles comprising three-semitone intervals on adjacent strings, and stacks consisting of two-semitone intervals on three adjacent strings. The missing 4ths and 7ths of the major modes and the missing 2nds and 6ths of the minor modes fit cleanly inside the rectangle and around the stack.

When the rectangle or stack overlaps the major third interval between the G and B strings, its shape is warped (the part on the B & E strings is shifted one fret up), and this affects Forms 2, 3, and 4 of the pentatonic scale.

When filling in the missing notes inside the rectangle to complete a mode, the more those notes are shifted toward the bridge, the brighter the mode will sound. Dorian/Lydian have both notes toward the bridge; Aeolian (natural minor) and Ionian (major) have a staggered pattern; and Phrygian/Mixolydian have both notes shifted toward the nut. The difference between major and minor is which note position is the root.

When adding notes around the stack, the more the notes are shifted up and toward the nut, the brighter the mode. Dorian/Lydian have both notes toward the nut; Aeolian/Ionian (minor/major) have a staggered pattern; and Phrygian/Mixolydian have both notes toward the bridge.