Early Childhood Memory

This is some fucked up shit and it would explain a lot.. For some reason I remember this movie when I was a kid. It's from 1973.  I was 6 or 7. When I looked it up on IMDB It was listed as X (in the UK) rated but PG in the US. It's about a psycho who murders and dismembers blonde women in a hotel. I still remember the song.

This is the trailer for it

Wicked Wicked