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The odd one: vii°
One more look at what you missed.
The triad on B, in C major, against B minor.
B, D, F uses only white keys, so it belongs to C major. It sounds tense, neither bright nor dark.
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From B to F is six semitones, not seven.
The fifth is one semitone smaller than a perfect fifth. You heard six semitones in the intervals unit: the tritone.
Minor third plus a smaller fifth: a diminished triad.
It is written with a small circle. B° means B diminished, and in a key its numeral is vii°.
How many semitones from root to fifth in a diminished triad?
Play B, D, F, then B, D, F♯.
With F♯ the fifth is perfect and the chord is B minor. With F it is B diminished.
Find the root, count three semitones up, then three more. Keep the root as the lowest note.
Every major key has one diminished chord, on note 7.
In G major it is F♯, A, C. In F major it is E, G, B♭.
This chord belongs to C major. Which numeral is it?
You know the odd one out.
What you learned
- The chord on note 7 of a major key is diminished: vii°.
- A diminished triad is a minor third and a fifth of six semitones.
- Its fifth is one semitone smaller than a perfect fifth, so it sounds tense.
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