A repeated OSTINATO pattern
Sustained notes of LONG DURATION
TREMOLO strings
A CRESCENDO with gradually increasing DYNAMICS
Increasing TEMPO (Accelerando)
PITCH getting higher
The use of SILENCE before dramatic moments
Unusual harmonies (minor, DISSONANT, CHROMATIC CHORDS)
DISCHORDS and DIMINISHED CHORDS
IRREGULAR TIME SIGNATURES (5/4, 7/8)
Rapid Scale Patterns
INTERRUPTED CADENCES
The use of the TRITONE (Augmented 4th)
Low pitch brass and strings for a "dark sound"
Percussive metallic sounds
SUSPENSIONS that don't resolve
Frequent changes in DYNAMICS
Electronic sounds and synthesisers
SAMPLED SOUNDS
Effects like REVERB or DISTORTION
Unusual instruments (e.g., Theremin)