Part 3: Hear and measure relationships · Lesson 026 / 117
Use an interval reference card
Reference lessonLocate the remaining simple intervals without memorising them all today.
You now know the measuring method. A reference card can hold the remaining facts while you practise applying it. The aim is not to recite twelve names at speed.
From a fixed C, the common simple intervals are: C unison; Db minor second; D major second; Eb minor third; E major third; F perfect fourth; Gb diminished fifth; G perfect fifth; Ab minor sixth; A major sixth; Bb minor seventh; B major seventh; C octave. Their semitone distances are 0 through 12 in that order.
The pitch six semitones above C can also be spelled F#, an augmented fourth. The spelling changes the interval name. We return to this where it matters; do not let that exception replace the basic method.
For today's task, choose only the second and the sixth. Identify their letters first, then consult the distance. Keep the full card available for later chord formulas.
Hear it
Sixths
Audio fileFour-beat count-in · 60 BPM · Warm sampled electric guitar. Listen once before playing along.
A concrete example
C–D = major second, 2 semitones. C–A = major sixth, 9 semitones. C–Ab = minor sixth, 8 semitones.
Try it, slowly
- Find C–D on one string.
- Find C–A and then lower A to Ab.
- Use the card to check your answers instead of guessing a shape.
Check one idea
If you lower the A in C–A by one semitone, which interval results?
Show the explanation
C–Ab is a minor sixth. The letter span remains C through A, while the distance changes from nine to eight semitones.
A good place to stop
You can use the card accurately; instant recall of every interval is not required.
Return to the example after a short break. A clear explanation matters more than speed.