During the year of 1975 someone played a song for me that had the sound of a hearting beating loudly... I thought he said it was by a group, but I'm not sure... it might have been instrumental or might have had words too.
The heart beating was very eerie sounding.

Dark Side of the Moon, by Pink Floyd?

I agree with Strat, that would be my first guess: Pink Floyd - The Dark Side of the Moon (1973) [Full Album] (HD 1080p) - YouTube (http://www.youtube.com/watch?v=328WhjAXpcs)