Fretwise

Chapter 3

Intervals — The Building Blocks

Distances between notes are the atoms of music. Learn how to name, hear, and play every interval — and why this single skill unlocks scales, chords, and melody.

An interval is the distance between two notes. That’s it. But intervals are everything: scales are stacks of intervals, chords are stacks of intervals, melody is a sequence of intervals, harmony is intervals sounding together.

If you can recognise intervals by ear, you can transcribe songs. If you can find them on the fretboard, you can improvise. If you can stack them, you can write chords from nothing. This is the single highest-leverage skill in music theory.

We’ll cover the twelve intervals (unison through octave), how each one sounds and feels, the shapes for them on guitar, and how to practise recognising them.

Lessons in this chapter

  1. 1 What an interval is The exact, unambiguous definition of an interval — measured in half-steps, named by quality and number.
  2. 2 Major, minor, perfect — what the qualities mean Why some intervals are "major/minor" and others are "perfect" — and the simple rule that decides which.
  3. 3 Every interval as a shape on the fretboard Each interval has 2–3 consistent visual shapes on the guitar. Learn them once and you'll see intervals everywhere.
  4. 4 Ear training — recognising intervals The skill that lets you transcribe songs by ear. A simple, sustainable routine to internalise every interval.
  5. 5 Consonance, tension, and how intervals "feel" Why some intervals sound smooth and others sound restless — and how to use that contrast on purpose.