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Understanding Musical Intervals — The Foundation of Every Chord
Understanding Musical Intervals — The Foundation of Every Chord
Why This Matters
Why This Matters
Before you can build a single chord, you need one essential skill: measuring the distance between two notes. In music, this distance is called an interval.
Every chord, every scale, and every voicing you'll ever play is built from these basic measurements.
Don't worry — this isn't abstract math. Once you see it on the keyboard and hear it with your own ears, it becomes simple and intuitive.
The Smallest Distance: The Semitone
The Smallest Distance: The Semitone
Look at your piano keyboard. The smallest possible distance between any two keys — black or white — is called a semitone (also called a half-step).
Example:
C to C# is a semitone
E to F is a semitone (notice there's no black key between them — they're still right next to each other)
🎧 Play It, Don't Just Count It
Play C, then C# right next to it, slowly, back and forth. Listen to how close and tense they sound together — almost uncomfortable. That tension is the sound of a semitone. Your ear will start recognizing it before you even count.
C to C#
E to F
💡 Rule of thumb: if two keys are right next to each other with nothing in between, that's one semitone.
The Next Step: The Tone
The Next Step: The Tone
A tone (also called a whole step) is simply two semitones combined — you skip one key.
Example:
C to D is a tone (you pass over C#)
D to E is a tone (you pass over D#)
C to D
D to E
Counting on the Keyboard
Counting on the Keyboard
Here's the practical method: place your finger on any key, then count every key you touch — black and white — moving upward.
From C, counting semitones:
This simple counting method is how every interval in music is measured.
Why This Matters for Chords
Why This Matters for Chords
Here's why this matters: the difference between a Major and Minor chord comes down to the distance between the Root and the 3rd — something you'll learn to build in our next lesson.
Now you can actually verify it yourself:
🎧 Play It and Compare
Play C-E, then right after, play C-Eb. Same two notes, moved by just one key — but listen closely: one sounds open and confident, the other sounds like it's holding something back. That's the entire emotional difference between Major and Minor, and you just heard it yourself.
That one-semitone difference (E vs Eb) is the entire reason a chord sounds bright or dark.
You don't need to memorize this whole table right now — just the Major 3rd and Minor 3rd are enough to move forward to the next lesson. The Diminished 5th and Augmented 5th will matter very soon though: they're exactly what turns a Major triad into a Diminished or Augmented one, which you'll see in the lesson right after next.
What's Next
What's Next
Now that you can measure the distance between any two notes, you're ready to apply this skill directly.
In the next lesson, we'll use exactly this method to build your first real jazz chord, note by note.
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