OK, guess I'll throw in my 5...at first had to think which 5 have stuck with Me. Then thought of several more
For now, here they are.
1-PSYCHO (1960). Groundbreaking and still frightening Bernard Herrman score.
2-NIGHT OF THE LIVING DEAD (1968). While it's mostly library music and taken from other films (Two being TEENAGERS FROM OUTER SPACE and THE HIDEOUS SUN DEMON), feel it's effectively used.
3-HORROR OF DRACULA (1958). Love the bombastic music during the opening credits...
4-FRIGHT NIGHT (1985). The song "Come To Me" when Jerry initiates Amy
5-THE THING (1982). So spare and so creepy!