Hammer film?

I am not sure what the plot of the movie is that I am looking for. I saw it on late night tv as a kid back in 1977. But it was in a gothic setting. To me the lead actor looked a lot like Maxwell Caulfield....but according to IMDB his first movie was in 1982. But there was music in the film that by looking on the internet I learned that it is titled The Hearse Song. I cannot remember for sure if the words were sung during the soundtrack but my friend's cousin, who we were watching this movie with, was singing the tune with the words...."The worms crawl in. The worms crawl out. In your stomach and out your mouth." This is a link to the tune:

http://www.goblinville.com/pages/writings/lyrics/worms-crawl.htm


Does anybody know what film this was or if it was a Hammer film? I have been racking my old brain trying to figure it out and what the plot of the movie was. I can't think of it to save my life.