I was looking on youtube today exploring suitable audio for my opening sequence. I typed in 'suspenseful music'. Helping me get a rough idea of the types of audio is expected to be played within a thriller sequence. Many videos where listened to and i came across some interesting sounds. This definitely helped me get a gist of the type of music should be played within my opening sequence.
These are some of the examples i heard on youtube of sounds that build suspense. I like them both as they managed to give me a clear idea of what a sound track should sound like for an opening sequence.