Soundtrack (copyright free) (Tomasz Wojton)

One copyright music creator is Ross Bugden who uploads his music to Youtube. He concentrates on making music suitable for thrillers and encourages others to use it.
link: https://www.youtube.com/channel/UCQKGLOK2FqmVgVwYferltKQ

This is a list of thrillers with very successful soundtracks:

This is a well know song segment from 'Psycho' which creates and eerie atmosphere and suggests incoming danger.

A different but still successful song is Dream is Collapsing by Hans Zimmer in 'Inception' . In this case the music creates an intense atmosphere.

This is one specific example we can possibly use. It creates a dark and mysterious atmosphere with is perfect for our thriller film.

This is a another example that creates a similar mood.

Another really good music composer is Mattia Cupelli who makes music which is probably most likely to fir our thriller opening

https://www.youtube.com/user/MattiaCupelliMusic