Answer:
It was thought to be the interval of the devil.
Step-by-step explanation:
A tritone is an interval in music that is made up of three tones, or six semitones. The tritone occurs between the fourth and the seventh degrees of the scale. This was also known as the "devil's interval" or "diabolus in musica." The tritone was disliked because of ts grating quality, which goes against the traditional purpose of music: harmony and beauty.