Black Sabbath performs during their Heaven and Hell tour in 1980. The band helped revive the long-feared “Devil’s interval”—a dissonant sound once shunned by medieval choirs—as the backbone of heavy ...

Cognitive dissonance is everywhere — but it’s not well understood. When we’re aware of it, it can be a powerful motivator for behavioral change and enhance insight. When we're not, it can cause us to ...

The tritone has been blamed for chaos, banned by choirs, and embraced by metalheads. Here’s what the 'devil's interval' really does to your brain. Black Sabbath performs during their Heaven and Hell ...