The Blues Scale Explained
The blues scale is a minor pentatonic scale with one added note: the flat 5th(also called the "blue note"). This chromatic passing tone creates the signature tension and release that defines blues music.
Formula: 1 - ♭3 - 4 - ♭5 - 5 - ♭7
In the key of A, that's: A - C - D - E♭ - E - G
A Blues Scale - the foundation of blues guitar
Open in full appThe blue note (E♭ in A blues) shouldn't be held for long - it's a tension note that wants to resolve. Bend into it, slide through it, or use it as a quick passing tone.
For a more sophisticated approach to blues, explore Mixolydian mode, which works perfectly over the dominant 7th chords found in blues progressions.
The 12-Bar Blues Form
The 12-bar blues is the most common blues progression. It uses three chords: the I, IV, and V (one, four, and five) of the key. Here's the standard form:
- Bars 1-4: I chord (4 bars)
- Bars 5-6: IV chord (2 bars)
- Bars 7-8: I chord (2 bars)
- Bar 9: V chord (1 bar)
- Bar 10: IV chord (1 bar)
- Bars 11-12: I chord (2 bars, with turnaround)
12-Bar Blues in A
The classic 12-bar blues form. Use A blues scale over all chords.
Essential Blues Boxes (5 Positions)
The minor pentatonic and blues scale can be played in 5 positions across the fretboard. These "boxes" connect to form a complete picture of the scale.
Position 1 (The "Box" Position)
This is the most famous position, centered around the root note on the 6th string. In A, this starts at the 5th fret.
Position 2
This position starts on the 3rd of the scale and is great for connecting to Position 1. In A, this starts around the 7th fret.
Blues Phrasing: Beyond the Notes
Great blues isn't about playing the right notes - it's about how you play them. These techniques are essential:
Bends
- Whole step bends: Bend the 4th up to the 5th, or ♭7 up to the root
- Half step bends: Perfect for the blue note
- Pre-bends: Bend before picking, then release
- Bend and hold: Add vibrato at the top of the bend
Vibrato
Vibrato is your voice on the guitar. Wide, slow vibrato sounds expressive. Fast, tight vibrato sounds intense. Find your personal style.
Slides
Slides into notes sound smooth and vocal. Try sliding into the root or 3rd from a fret or two below.
Space
The most powerful blues tool is silence. Let notes ring out. Leave gaps. Make each note count.
Mixing Major and Minor Pentatonic
One of the secrets of great blues is mixing the minor pentatonic with themajor pentatonic. This creates a sweet-and-sour effect that keeps listeners engaged.
The key difference: minor pentatonic has a ♭3 and ♭7, while major pentatonic has a natural 3 and 6. The major 3rd sounds happy and bright against the dominant 7th chords in blues.
A Major Pentatonic - mix with minor pentatonic for classic blues sound
Open in full appHow to Mix Them
- Use minor pentatonic for tension and grit
- Switch to major pentatonic for resolution and sweetness
- Try major over the I chord, minor over the IV chord
- Bend from the minor 3rd up to the major 3rd (classic B.B. King move)
12-Bar Blues in E
Practice mixing A major and minor pentatonic shapes starting at the open position.
Blues in Different Keys
Blues in E
E is the most guitar-friendly blues key. You can use open strings and the first position minor pentatonic.
Shuffle Blues in E
Classic Chicago blues feel. Use E minor pentatonic and blues scale.
Minor Blues
Minor blues uses minor chords instead of dominant 7ths for a darker, more melancholic sound. For minor blues, Dorian mode is an excellent choice alongside the blues scale.
Minor Blues in A
A darker blues sound. Stick to A minor pentatonic/blues scale or A Dorian.
Jazz Blues
Jazz blues adds more chord movement and substitutions, creating more opportunities for chord-tone-based playing.
Jazz Blues in Bb
More chord movement requires more attention to changes. Mix blues scale with chord tones.
Essential Blues Practice Tips
- Learn licks, then make them yours: Study classic blues licks, but modify them with your own phrasing and note choices.
- Practice with backing tracks: Always play over changes, not in isolation. This trains your ears to hear the form.
- Transcribe your heroes: Learn solos note-for-note from players you admire. This absorbs their vocabulary and phrasing.
- Focus on one position, then expand: Master Box 1 completely before connecting to other positions.
- Play slow and mean it: Fast playing impresses briefly. Slow, emotional playing stays with listeners.
Recommended Listening
Study these masters to develop your blues vocabulary:
- B.B. King - Master of major/minor pentatonic mixing and vibrato
- Albert King - Aggressive bends and powerful phrasing
- Stevie Ray Vaughan - Texas blues intensity and technique
- Freddie King - Melodic lines and string bending
- Buddy Guy - Raw emotion and dynamic range