Quite by chance the other night I came across The Collector, a 1965 film starring Terence Stamp and Samantha Eggar, which was being shown on late night telly. It's quite a scarey story about creepy loner and butterfly collector Freddie (Terence Stamp) who kidnaps art student Miranda (Samantha Eggar) just for the hell of it and keeps her prisoner in the cellar of his posh Tudor home (Freddie had suddenly become rich by winning the pools some time hence).
It's a great film in a 1960s kind of way, with some interesting outdoor shots in London and a small English village, although what struck me most was the music used during the film in great quantities and to great effect. Getting to the closing titles I saw that the soundtrack was done by none other than Maurice Jarre, father of Jean Michel, who did quite a lot of film music in his time, and who sadly passed away a few years ago. Here's a taste of Jarre's work with the 'theme' I found on youtube. I'd love to locate the full soundtrack album if it's still out there.
NB "The Collector" not to be confused with a 2009 American horror movie of the same name which is probably nowhere near as good.