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 ...

"We can be blind to the obvious, and we are also blind to our blindness." –Daniel Kahneman Cognitive dissonance, a psychological phenomenon first identified by Leon Festinger in 1957, refers to the ...

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 ...