There’s an interval so dissonant that it’s earned the nickname ‘The Devil’s Interval’ and was avoided for centuries by composers and the pupils they taught.
What is a tritone and why was it nicknamed the devil's interval? - Classic FM
Tritone - Wikipedia
What is a tritone and why was it nicknamed the devil's interval? - Classic FM
How Did the Tritone Get Such a Devilish Reputation?, WQXR Editorial
What are the best examples of 'the Devil's tritone'? - Quora
The Tritone: the devil in music
In The Witch (2015), when Thomasin is sent by her mother to check on the animals around the 29 minute mark, the goats are bleating notes that are a tritone apart (E
Tritone - Wikipedia
Medieval composers were discouraged from using the Devil's interval