How many half steps apart are a major 3rd and a minor 3rd?

A major 3rd is 4 half steps above the root; a minor 3rd is 3 half steps above the root. It's only a one half-step difference, but it's exactly what makes a chord sound major (bright) or minor (dark).

Do A minor pentatonic and C major pentatonic really share the same notes?

Yes. A minor pentatonic (A-C-D-E-G) and C major pentatonic (C-D-E-G-A) contain exactly the same five notes. They're relative keys — only the order and the tonic (the note that feels like "home") differ.

Why does the relative minor start on the 6th degree specifically?

Starting a major scale's 6th note as the new tonic naturally produces the structure of a natural minor scale. The 6th degree of C major is A, so C major's relative minor is A minor.

A song is in C major — can I still use the A minor pentatonic shape?

Yes, because the notes are identical. Just make sure your phrases resolve to C (the major tonic) to keep the major feel — resolving to A will make it sound minor instead.

Does the 5th change between major and minor chords?

In a basic triad, the root-to-5th distance is a perfect 5th (7 half steps) in both major and minor chords, so it generally stays the same. The 3rd is what changes the color, not the 5th. Altered 5ths (diminished, augmented) are a topic for a later lesson.

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Learn Electric Guitar · Part 20

Guitar Intervals, Relative Keys & Picking the Right Pentatonic Scale

If you've already got the minor pentatonic shape under your fingers, it's time to learn why those five notes work so well together. The key is intervals — measuring the distance between two notes in half steps. That one idea explains whether a chord is major or minor, why the A minor pentatonic shape works perfectly over a song in C major, and how to pick the right pentatonic scale for any song you're playing along to.

This lesson isn't about memorizing formulas — it's about building a sense of distance on the fretboard. Once "one fret equals one half step" clicks, everything else follows naturally.

🎯 Bottom line: An interval is the distance between two notes, measured in half steps (one fret each). A chord's skeleton is its root, 3rd, and 5th. What separates major from minor is the size of the 3rd — a major 3rd (4 half steps) gives you major, a minor 3rd (3 half steps) gives you minor. A minor pentatonic and C major share the exact same notes as relative keys, because a relative minor starts on the 6th degree of its major scale — and the 6th degree of C major is A. Once you know a song's key, picking a pentatonic is simple: use that key's minor pentatonic for a minor key, or that key's major pentatonic for a major key (which shares its notes with its relative minor pentatonic).

Step 1 · Interval Basics: Root, 3rd and 5th

An interval is the distance between two notes. On guitar, the most intuitive unit is the half step (semitone) — one fret on a single string. A whole step (whole tone) is two half steps, or two frets.

A chord is built from three pillars:

Root (1st) — the reference note that names the chord. It's the starting point.
3rd — the note that decides whether the chord is major or minor. It's stacked above the root.
5th — the note that anchors the chord and gives it stability. Also stacked above the root.

Take a C major chord: its notes are C – E – G. C is the root, E is the 3rd, G is the 5th. From root to the perfect 5th (G) is 7 half steps — and that distance stays basically the same whether the chord is major or minor. In other words, the note that changes a chord's color isn't the 5th — it's the 3rd.

HowTo · Counting Half Steps on the Fretboard

Moving one fret on the same string is a half step.

Moving two frets is a whole step.

On the same string, 4 frets above the root gives you a major 3rd; 3 frets above gives you a minor 3rd.

Step 2 · Major 3rd vs Minor 3rd: The One Half Step That Separates Major from Minor

There are two kinds of 3rds, and this difference decides the entire mood of a chord.

Major 3rd = 4 half steps. Example: C → E (4 frets above C on the same string).
Minor 3rd = 3 half steps. Example: C → E♭ (3 frets above C on the same string).

Just one half step of difference, but the sound is completely different. A bright, open sound is a major 3rd; a darker, more subdued sound is a minor 3rd.

A major chord's skeleton = major 3rd + minor 3rd. Root to 3rd is a major 3rd (4 half steps), 3rd to 5th is a minor 3rd (3 half steps) — together, root to 5th adds up to a perfect 5th (7 half steps).

A minor chord's skeleton = minor 3rd + major 3rd. Root to 3rd is a minor 3rd (3 half steps), 3rd to 5th is a major 3rd (4 half steps) — root to 5th still adds up to a perfect 5th (7 half steps).

🔍 Key takeaway: If the 3rd above the root is a major 3rd (4), the chord is major; if it's a minor 3rd (3), the chord is minor. Leave the 5th alone and drop only the 3rd by one half step, and a major chord becomes minor.

HowTo · Telling Major from Minor by Ear

Play the root note, then ring out its 3rd together with it.

Bright and strong is a major 3rd (major chord); a bit sad and soft is a minor 3rd (minor chord).

Not sure yet? Use ear training to hear the two back to back until the difference clicks.

Step 3 · Relative Keys: A Minor Pentatonic ≈ C Major

Think back to the A minor pentatonic (A – C – D – E – G) shape you already know. Surprisingly, those notes are exactly the same five notes as the C major pentatonic (C – D – E – G – A). Only the order — and which note feels like "home" — is different.

Two keys that share the same notes but have a different tonic like this are called relative keys.

A relative minor starts on the 6th degree of its major scale.
The C major scale is C – D – E – F – G – A – B, and its 6th note is A.
So C major's relative minor is A minor, and conversely, A minor's relative major is C major.

The same relationship applies directly to pentatonic scales: A minor pentatonic = C major pentatonic — identical fretboard shape, with only the target note changing depending on which key the song is in.

HowTo · Finding a Relative Major/Minor Fast

Major → relative minor: go down a minor 3rd (3 half steps) from the tonic. Three frets down from C is A → C major's relative minor is A minor.

Minor → relative major: go up a minor 3rd (3 half steps) from the tonic. Three frets up from A is C → A minor's relative major is C major.

Double-check: confirm the major scale's 6th degree matches the relative minor's tonic. C major's 6th degree = A. ✅

Step 4 · Matching a Pentatonic Scale to a Song's Key

Now for the practical part. Once you know a song's key, picking the right pentatonic is straightforward.

Rule 1 · Minor key → use that key's minor pentatonic directly. Example: a song in A minor (Am) → play the A minor pentatonic shape you already know.

Rule 2 · Major key → use that key's major pentatonic. Example: a song in C major (C) → play the C major pentatonic. Thanks to the relative-key relationship, the C major pentatonic shares its notes with the A minor pentatonic — so you play the exact same shape as A minor pentatonic, but treat C as the note you're resolving to, and it reads as a major pentatonic.

Rule 3 · Don't know the key? → the note a song returns to most often, the one that feels "finished," is likely the tonic. If that note sounds bright, lean toward the major pentatonic; if it sounds dark, lean toward the minor pentatonic.

HowTo · Applying a Pentatonic Over a Song (3 Practical Steps)

Check the song's key → minor key uses Rule 1, major key uses Rule 2.

Play that pentatonic's fretboard shape. (These shapes get expanded into five full positions in a later lesson.)

Resolve your phrases on the minor tonic for a minor song, or the major tonic for a major song, and your lines will sound settled and intentional.

💡 Watch out: A relative key means "same notes, different center." The notes themselves are shared — it's where you choose to land (the tonic the song calls for) that decides whether it reads as major or minor.

Practice This With Our Tools

The difference between a major 3rd and a minor 3rd sticks far better when you train your ear than when you just memorize the numbers. Use ear training to hear the two 3rds back to back, and use a scale tool to see for yourself why relative keys sound like they share the same notes — because they do.

Train your ear on major 3rd vs minor 3rd until you can hear the brightness difference instantly
Confirm with a scale tool that A minor pentatonic and C major pentatonic really are the same notes
Practice as much as you want — free, no install, no sign-up

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FAQ

How many half steps apart are a major 3rd and a minor 3rd?: A major 3rd is 4 half steps above the root; a minor 3rd is 3 half steps above the root. Just one half step of difference, but it's exactly what makes a chord sound major (bright) or minor (dark).
Do A minor pentatonic and C major pentatonic really share the same notes?: Yes. A minor pentatonic (A-C-D-E-G) and C major pentatonic (C-D-E-G-A) contain the exact same five notes. Only the order and the tonic differ — that's what makes them relative keys.
Why does the relative minor start on the 6th degree specifically?: Starting a major scale's 6th note as the new tonic naturally produces the structure of a natural minor scale. The 6th degree of C major is A, so C major's relative minor is A minor.
A song is in C major — can I still use the A minor pentatonic shape?: Yes, because the notes are identical. Just resolve your phrases to C (the major tonic) to keep the major feel — resolving to A instead will make it sound minor.
Does the 5th change between major and minor chords?: In a basic triad, root-to-5th is a perfect 5th (7 half steps) in both cases, so it generally stays the same. The 3rd is what changes the color, not the 5th. (Altered 5ths like diminished or augmented are covered in a later lesson.)

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