Another early 70's soundtrack that is very distinctive is in 'Harold and Maude' with Cat Stevens providing the music. It's a great film that i would recommend to you, blackly comic and subversive, yet heartwarming and touching.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.