Intervals Interval Construction Lesson 3

Thirds: Spell the Major/Minor Colour

Build major and minor 3rds above every natural root. The 3rd decides major versus minor — count two letter names up, then check the semitones: four for major, three for minor.

Beginner ~5 min thirds construction

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Skills you'll train

interval building major minor
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Half Steps: Build Minor 2nds
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Perfect 4ths & 5ths: The Pillars