The Hills Run Red (1966) is one I can think of.
www.youtube.com/watch?v=vkl7daH6M0w (http://www.youtube.com/watch?v=vkl7daH6M0w)
Then, Rolling Thunder's opening credits theme:
www.youtube.com/watch?v=qH47xPX7c8o (http://www.youtube.com/watch?v=qH47xPX7c8o)
Leon The Professional.
! No longer available (http://www.youtube.com/watch?v=nVYFOlVB-Uo#)
GLADIATOR has a gorgeous soundtrack.
the GOOD, the BAD, and the UGLY (1966)
The music makes this movie.
http://youtu.be/aJCSNIl2Pls (http://youtu.be/aJCSNIl2Pls)
The theme music to Cannibal Holocaust is weirdly beautiful, esp. when contrasted with the horrible goings-on depicted in the film..
! No longer available (http://www.youtube.com/watch?v=GCYndZn6wuk#)
Lifeforce.
Kingsman: The Secret Service
! No longer available (http://www.youtube.com/watch?v=t1WWDBTda2Y#)
A Clockwork Orange
Badlands.
! No longer available (http://www.youtube.com/watch?v=-CxCQlYDxpg#)
The Case of The Bloody Iris
http://youtu.be/Qn_Ut3ZE76U (http://youtu.be/Qn_Ut3ZE76U)
TAXI DRIVER (1976)
http://youtu.be/guV8Tp9oi3Q (http://youtu.be/guV8Tp9oi3Q)
PSYCHO (1960)
http://youtu.be/qMTrVgpDwPk (http://youtu.be/qMTrVgpDwPk)