A madman (voiced by James Mason) tells his tale of murder, and how a strange beating sound haunted him afterward.
The animation of this short is pretty decent and fits the material well without being too grisly. But, of course, the real joy is in the narration. When it comes to telling a story so well-known and often repeated, it pays to get just the right voice. And James Mason is the one for that (though Vincent Price would also work).
I remember this story being longer. Now, that might be my memory or it might be that they abridged it. But I have fond memories of the first time I ever heard the story in an elementary class. (I don't believe I actually read Poe's work until later.) The tape I heard was not Mason, but I wish it had been.