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What is tritone?
The three wide — exactly half an octave, and the most restless sound in Western harmony. It's the ♭5 '' and the tension inside every .
A tritone spans three whole tones — six half-steps — which lands it precisely halfway across the octave. That symmetry makes it the most unstable interval in tonal music; medieval theorists nicknamed it diabolus in musica, 'the devil in music.' It's the flattened fifth the blues adds to the minor , and it's the gap between the third and seventh of a dominant seventh chord — the very tension that makes such a chord lean home toward the .
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