horror movie music instrument

Does anyone know what this music thriller / sound effect is called?
I'm doing a horror film in school in my media class and I need some suspenseful music. There is a special effect sound or track that I like, but do not know what it's called or where to get it. It is an instrument string is pulled. It makes you feel like spiders crawling on you (or maybe just me). I think it might be a violin or a harp. Has been used in many films but I can not seem to find it. Does anyone know what this sound effect or track could be called or where I can get. Any help is appreciated.
yes is called a tremolo. It is an exciting suspensful music.
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