Medieval composers were discouraged from using the Devil's interval
The history of the devil's tritone, told through 10 key tracks
The Devil in Music (AKA the Tritone)
The Devil In Music - Tritones vs Augmented 4ths & Diminished 5ths - Hear and Play Music Learning Center
Devil's interval: What makes music sound scary?
Tritone - Music Theory Academy
The Tritone: the devil in music
Why the Tritone = The DEVIL in Music – Professional Composers
The Tritone, Everything You Need to Know