Tolkien wrote many stories, not all of them about Middle-earth, and this is my ranking of all of them.  

For reviews of some of these check out the following links:  

Roverandom: https://www.youtube.com/watch?v=_8hJR1Kj5qY 

Farmer Giles of Ham: https://www.youtube.com/watch?v=O32CpI0rOgg 

Leaf by Niggle: https://www.youtube.com/watch?v=5OdiCz3JwHA 

Smith of Wootton Major: https://www.youtube.com/watch?v=JyzNBaaHZqY 

Beren and Luthien (note, the book is more about the textual history than just a straight story): https://www.youtube.com/watch?v=XTGPOdzjSFg 

The Children of Hurin: https://www.youtube.com/watch?v=YKWzsP_3tcY 

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