4. The 12 Musical Notes ➜ Circle of Fifths

Ever wondered how legendary riffs and unforgettable melodies are forged? The journey begins with 12 musical notes. Master these, and you'll unlock the secret language of music.

The Heart of All Songs: 12 Musical Notes

• These are the 12 musical notes in Western music.

• Each black key has two names.
  • Example: The black key nestled between C and D can be called C♯ (C-sharp, meaning a half-step higher than C) or D♭ (D-flat, meaning a half-step lower than D). They're the same note, just different ways to label it depending on the musical context.
• These are the same 12 musical notes shown on a guitar fretboard:

12 Musical Notes → Octave

• The 12 musical notes form a unit called an octave.
• On the guitar, notes higher up the fretboard (closer to the body) are in higher octaves and produce a higher pitch. Notes closer to the headstock (by the tuning pegs) are in lower octaves and produce a lower pitch.
• Each of the six strings on the guitar also has its own pitch. The thicker strings produce lower pitches, and the thinner strings produce higher pitches.
• So while there are only 12 musical notes, each note has lower and higher pitch versions across different octaves.

Tip 1: Play the open E string (the thickest one), then the 12th fret— that's one octave higher.

Tip 2: Play the low E string (low thickest one), then play the high E string (the thinnest one). The high E string sounds higher pitch, because it is exactly two octaves higher than the low E string.

12 Notes → The Circle of Fifths

When first learning guitar, you might assume that notes next to each other on the fretboard (like C and C♯) will naturally sound harmonic. However, the most harmonic interval (besides octaves) is the Perfect Fifth.

The Perfect Fifth

• Example: Start on C. Count up seven notes (also known as semitones or half-steps) C → C♯ → D → D♯ → E → F → F♯ → G. You arrive at G. The distance from C to G is a Perfect Fifth.

• This interval is called a Perfect Fifth, the most harmonic interval in Western music.
• A Cornerstone of Music: The Perfect Fifth isn't just a pleasant sound; it's a fundamental building block for chords, scales, and compelling melodies across genres. It provides a sense of stability and strong harmonic pull.
• From C, we found its Perfect Fifth: G.

• Now, ascend another Perfect Fifth (seven notes) from G. You'll land on D.

• Continue this pattern from D, and your next Perfect Fifth will be A.

• Forging the Circle: By systematically progressing from one note to its Perfect Fifth, and then from that new note to its Perfect Fifth, we eventually cycle through all 12 notes. This powerful sequence, when visualized, forms the Circle of Fifths.

The Circle of Fifths: Your Roadmap to Musical Keys

• The Circle of Fifths is typically visualized as a clock face, with each "hour" representing one of the 12 notes or keys.
• Organizing Keys: This elegant structure masterfully organizes all 12 musical keys, clearly illustrating the relationships between them and, by extension, their foundational chords.
• Major and Relative Minor Keys:
  • The outer ring traditionally displays the Major keys (e.g., C Major, G Major, D Major).
  • An inner ring often shows the relative minor key for each Major key (e.g., A minor is the relative minor of C Major; E minor for G Major, and so on).
  • Minor keys share the same key signature/notes as its major counterpart.
• Harmonic Symmetry: These relative minor keys also follow the same clockwise progression of fifths, mirroring their major counterparts and highlighting their close relationship.

Using the Circle: Understanding Harmonic Relationships

The true power of the Circle of Fifths lies in understanding the harmonic distance it reveals between keys and notes.

• Proximity = Stability (Consonance): Adjacent notes on the Circle of Fifths share tones, producing a smooth and stable sound when they are played together or sequentially.
• Listen: C then G

C

0:00

/2.4

1×

G

0:00

/2.4

1×

• Since G is a Perfect Fifth from C, they exhibit a strong, stable harmonic relationship.

• Distance = Tension (Dissonance): As you move further apart on the Circle, notes and keys share fewer common tones. This increasing distance can create more tension or what is often termed dissonance. This isn't inherently "bad"—dissonance is a crucial expressive tool in music, creating interest, drama, and a powerful urge for resolution.
• Listen: C then D

C

0:00

/2.4

1×

D

0:00

/4.625011

1×

• D is two Perfect Fifths from C. Therefore, it sounds slightly more tense.

• Listen: C then A

C

0:00

/2.4

1×

A

0:00

/2.4

1×

• A is three Perfect Fifths from C. Therefore, it sounds even more tense.

The key takeaway is that the Circle of Fifths visually represents degrees of harmonic tension between notes, not a strict rule of what is 'melodic' versus 'unmelodic.' Skilled songwriters harness these varying degrees of stability and tension to craft compelling musical journeys.

Knowledge Check: Test Your Understanding!

C

0:00

/2.4

1×

F#

0:00

/2.4

1×

C

0:00

/2.4

1×

F

0:00

/2.4

1×

Summary

• The 12 Musical Notes: There are 12 fundamental notes in Western music, with black keys having two names (e.g., C♯/D♭).
• Octaves: The 12 notes form an octave. Higher octaves produce higher pitches, and lower octaves produce lower pitches.
• The Perfect Fifth: The most harmonic interval in Western music, consisting of seven half-steps.
• The Circle of Fifths: A visual representation generated by systematically moving up by Perfect Fifths, organizing all 12 musical keys and their harmonic relationships.
• Harmonic Relationships on the Circle:
  • Proximity: Notes/keys closer on the circle share more common tones and sound more stable (consonant).
  • Distance: Notes/keys further apart share fewer common tones, creating more tension (dissonance), which is a valuable expressive tool.

Goal Achieved

You've gained a fundamental understanding of the 12 musical notes, the concept of octaves, and the crucial role of the Circle of Fifths in revealing harmonic relationships within music.

What's Next?

Unlock the core melodies of music! Building on your understanding of the Circle of Fifths, next chapter introduces you to the versatile pentatonic scale learning its structure and how to create compelling solos. You'll then expand your knowledge to the foundational major scale. Get ready to put your fingers on the fretboard and start crafting your own musical ideas over various chord progressions.