Guitar Theory

Theory Guides

Practical concepts for guitarists who want to understand what they're playing, not just memorize it.

Guitar Modes Explained: All 7 ModesModes

Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, and Locrian: what each mode sounds like, where it comes from, and when to use it.

The Dorian ModeModes

The most widely used mode in rock and jazz. Minor with a lifted, hopeful quality. One note separates it from natural minor.

The Mixolydian ModeModes

Major with a flat 7th. The mode behind blues, classic rock, and every dominant 7th chord groove.

The Phrygian ModeModes

Dark, tense, Spanish. The flat 2nd defines everything, from flamenco to metal.

The Lydian ModeModes

The brightest mode. A raised 4th creates a floating, dreamlike quality used by film composers and fusion guitarists.

The Locrian ModeModes

The most unstable mode. A diminished 5th makes it nearly impossible to use as a tonal center. Understanding why teaches you how harmony works.

How to Memorize the Guitar FretboardFundamentals

Octave shapes, natural notes, and landmark frets: a practical system for knowing every note on every string without brute-force memorization.

Guitar Scales for BeginnersScales

Which scales to learn first, in what order, and how to actually use them. Not just run them up and down.

What Scales to Play Over ChordsScales

Major chords, minor chords, full progressions, non-diatonic chords: know which scale fits and exactly why it works.

How to Find the Key of a SongFundamentals

Three methods for finding the key by ear and by chord, plus how to pick your scale once you have it.

How to Solo Over a I-IV-V ProgressionProgressions

The most common chord progression in music. Learn which notes to target over each chord and how to make your phrases follow the changes.

How to Solo Over a ii-V-I ProgressionProgressions

The backbone of jazz and pop harmony. Understand the role of each chord and which chord tones create the strongest melodic movement.

How to Solo Over a Minor ProgressionProgressions

Minor keys, major chords mixed in, and the flat 6th and 7th that catch players off guard. Here is how to handle all of it.

Why Does My Solo Sound Off?Problems

The most common reasons solos sound random or out of place, and the specific fixes that make the difference.

How to Connect Scales to ChordsProblems

Scales and chords are the same notes. Here is how to use that relationship to make your playing sound intentional.

How to Follow Chord ChangesProblems

Hear the chord coming, land on the right note, and make your solo respond to the harmony instead of running over it.

What Are Intervals?Fundamentals

The distance between two notes determines everything: scales, chords, and melody. Learn all 12 intervals and how to find them on the neck.

Major vs Minor: What Is the Difference?Fundamentals

One semitone separates major from minor. Understand why the 3rd defines the character of every chord and scale.

What Is a Pentatonic Scale?Scales

Five notes, zero clashing. Learn why the pentatonic is the most useful scale in guitar and how to use both the minor and major versions.

How to Read a Fretboard DiagramFundamentals

Strings, frets, dots, and root notes: everything you need to read any scale or chord diagram on the guitar neck.

The Major Scale, Modes & TriadsFundamentals

Start from the 12 notes of western music and build up to the major scale, all 7 modes, and the triad each one generates.

How to Solo Over Chord ChangesSoloing

Why targeting chord tones makes solos sound intentional, and how to do it over diatonic and non-diatonic chords.

David GilmourPlayers

Space, bends, and chord tone targeting. How Gilmour blends minor pentatonic, major pentatonic, Dorian, and Mixolydian to build solos that follow the harmony.

Dimebag DarrellPlayers

How Dimebag built solos from pentatonic and blues scale, used chromatics as aggression tools, grooved with the rhythm section, and soloed without rhythm guitar underneath him.

John MayerPlayers

Major pentatonic as the default voice, surgical chord tone targeting, and the blues minor-over-major blend that separates his playing from straightforward blues.

Eric ClaptonPlayers

Singing through the guitar. Minor pentatonic mastery, the Albert King bend vocabulary, blues scale at climactic moments, and why fewer notes with more commitment wins every time.

Eddie Van HalenPlayers

Pentatonic and major scale foundations beneath the tapping, harmonic minor for drama, and why his tap notes are almost always chord tones — not a technique trick.

Jimmy PagePlayers

Blues foundation, Dorian and natural minor for color, Celtic and folk modal influence, solos that reference the main riff, and the composed dynamic arc.

Stevie Ray VaughanPlayers

Texas blues intensity: minor pentatonic with Albert King bends, major-minor blending, Mixolydian over dominant grooves, and the behind-the-beat feel that made his groove unmistakable.

Carlos SantanaPlayers

Dorian as home, Phrygian for Latin drama, sustain and vibrato as theory tools, and melodic repetition over modal vamps — making one note say more than ten.

Jimi HendrixPlayers

Major-minor pentatonic blending, chord-melody integration, Dorian for extended passages, and the wah as a phrase-emphasis tool — the guitarist who changed everything.

Kirk HammettPlayers

Minor pentatonic blues foundation, Phrygian for metal darkness, harmonic minor for drama, chromatic aggression, and the wah as a note-emphasis device not just an effect.

Mark KnopflerPlayers

Fingerstyle tone as a theory choice, Mixolydian as the primary voice, diatonic thirds from country guitar, Dorian for minor, and phrasing built on storytelling not scale coverage.

Marty FriedmanPlayers

Exotic bends to microtonal pitches, harmonic minor and melodic minor for Eastern flavor, and a vibrato philosophy borrowed from Japanese traditional music.

Randy RhoadsPlayers

Classical training in a metal context: harmonic minor arpeggios, composed solos with a beginning and end, and the leading tone cadence that separates his playing from every peer.

John FrusciantePlayers

Hendrix as the primary language, Dorian for funk-minor grooves, melodic minor for harmonic sophistication, and chord voicings that omit the root because the bass already has it.

Zakk WyldePlayers

Five notes, total commitment. How Wylde built one of the most recognizable metal vocabularies by going deeper into the pentatonic box than anyone else rather than wider.

Joe BonamassaPlayers

The three Kings, British blues phrasing, major-minor pentatonic blending, and chord tone targeting across all three chords of a 12-bar: the most complete blues vocabulary working today.

Rory GallagherPlayers

Irish blues with no effects and no compromise. Physical attack as a theory choice, Celtic melodic contour in a blues context, and why Hendrix called him the best he had seen.

Gary MoorePlayers

Harmonic minor leading tones over slow blues, Peter Green as the philosophical foundation, and a wide vibrato that keeps sustained notes emotionally alive for their entire duration.

Peter GreenPlayers

The most selective note choice in British blues. Out-of-phase tone, flat 3rd and 5th as structural anchors, Dorian for bittersweet brightness, and variable vibrato calibrated to each note.

Robin TrowerPlayers

Hendrix vocabulary at half speed. Slow major-minor pentatonic bends, Dorian for sustained minor passages, and wah as atmosphere rather than note emphasis.