Middle-earth is the setting of much of J. R. R. Tolkien's legendarium. The term is equivalent to the term Midgard of Norse mythology, describing the human-inhabited world, i.e. the central continent of world of Tolkien's imagined mythological past. Tolkien's most widely read works, The Hobbit and The Lord of the Rings take place entirely in Middle-earth, and Middle-earth has also become a short-hand to refer to the legendarium or its "fictional-universe".
Within his stories, Tolkien translated the name "Middle-earth" as Endor (or sometimes Endórë) and Ennor in the Elvish languages Quenya and Sindarin respectively, sometimes referring only to the continent that the stories take place on, with another southern continent called the Dark Land.
Middle-earth is the central continent of Earth (Arda) in an imaginary period of the Earth's past (Tolkien placed the end of the Third Age at about 6,000 years before his own time), in the sense of a "secondary or sub-creational reality". Its general position is reminiscent of Europe, with the environs of the Shire intended to be reminiscent of England (more specifically, the West Midlands, with Hobbiton set at the same latitude as Oxford).
It's a wonderful world
A wonderful day
Live your life take a chance
And friends will be friends
[repeat]
Life isn't always fair
but that doesn't make it easier
When you haven't won
And I know life has a brighter side
But darkness makes me feel better
Than staring at the sun
Breath in
Gonna find your flow
Gonna take it slow
No matter what it takes
It's a wonderful world
A wonderful day
Live your life take a chance
And friends will be friends
[repeat]
Lost love, lost ones
Don't what your going thru
Bad days, bad words
Don't like what they're telling you
Wrong and right don't always shed some light
To help you see what's good
A wonderful day
Take it slow
Don't you know
No matter what it takes
It's a wonderful world
A wonderful day
Live your life take a chance
And friends will be friends