Intervals
Intervals as fretboard distance
Connect 2nds, 3rds, 4ths, 5ths, 6ths, and 7ths to the way notes sit around a root.
Intervals are relationships
An interval names the distance from one note to another, not a single fixed note.
A 3rd above C is E, while a 3rd above G is B. The relationship stays the same as the root changes.
Intervals describe musical motion
Small intervals tend to sound stepwise. Larger intervals can sound more open, dramatic, or chord-like.
On guitar, interval shapes help you move ideas without counting from scratch every time.
Compare a 3rd and a 5th
From C on the A string fret 3, play E on the D string fret 2 for a major 3rd.
Then play G on the D string fret 5 for a perfect 5th. The 5th sounds more open and stable.
Use the idea on your guitar
Root, 3rd, 5th
- Play C, E, and G slowly.
- Then play C to E several times, followed by C to G several times.
Listen for: Compare the color of the 3rd with the stability of the 5th.
Power chords and 5ths
Reference: Common rock rhythm-guitar vocabulary
Power chords lean on roots and 5ths because the perfect 5th sounds stable and strong without declaring major or minor.
Adding a 3rd would make the harmony more specific, which is sometimes useful and sometimes less flexible.
Choose an interval mood
Write a two-note riff that uses either mostly 3rds or mostly 5ths.
- Play it over the same root note.
- Describe whether your riff sounds colorful, stable, tense, or open.
Before you move on
- What does an interval measure?
- The distance or relationship between two notes.
- Why can a 5th feel stable?
- It strongly supports the root without adding major/minor color.