What it is
Five notes from the root: 1, ♭3, 4, 5, ♭7. It is the most widely-used scale in rock, blues, funk, and a big chunk of pop.
From the E string, fret 5 (A minor pentatonic):
G string: 5 7
D string: 5 7
A string: 5 7
E string: 5 8
Why it matters
This is the first scale where "noodling sounds like music" clicks. Most bass fills and walk-ups in rock/blues/funk are pulled from this shape. Learn it in one position first; transpose later.
How to practice
- Walk the shape up and down, slow, with alternating fingers. Open it in the fretboard explorer to see every note at once.
- Play the root, then any other note in the scale, back to the root. Listen. Every pair has a character.
- Put on any blues or rock backing track in A minor and just play notes from this shape. You literally cannot play a wrong note.
- Shift the whole shape up two frets — now you are in B minor pentatonic. Same shape, different root. This is the whole point of learning shapes.