Answer:

tritone

Answer	Crossword Clue
TRITONE	Dark interval heard in "Enter Sandman" and the "Simpsons" theme
TRITONE	The "diabolus in musica," to medieval monks
TRITONE	Musical interval also called an augmented fourth

TRITONE	Musical interval
TRITONE	Music interval
TRITONE	Half-octave
TRITONE	Augmented fourth
TRITONE	Musical interval.
TRITONE	Interval, in music.
TRITONE	Three-step musical interval
TRITONE	A musical interval

TRITONE	Three-whole-step interval
TRITONE	Interval of three whole steps
TRITONE	Musical interval aka augmented fourth
TRITONE	Musical interval of three whole steps