'Blowin' In the Wind'
by Bob Dylan

How many roads must a man walk down
Before you call him a man?
Yes, 'n' how many seas must a white dove sail
Before she sleeps in the sand?
Yes, 'n' how many times must the cannon balls fly
Before they're forever banned?
The answer, my friend, is blowin' in the wind,
The answer is blowin' in the wind.

How many years can a mountain exist
Before it's washed to the sea?
Yes, 'n' how many years can some people exist
Before they're allowed to be free?
Yes, 'n' how many times can a man turn his head,
Pretending he just doesn't see?
The answer, my friend, is blowin' in the wind,
The answer is blowin' in the wind.

How many times must a man look up
Before he can see the sky?
Yes, 'n' how many ears must one man have
Before he can hear people cry?
Yes, 'n' how many deaths will it take till he knows
That too many people have died?
The answer, my friend, is blowin' in the wind,
The answer is blowin' in the wind.

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Great song and very poetic. Odds are you have heard it.

Its rather clear to see the song is about the abstract questions in the universe.

Interesting note, in the 'Hitchhiker's Guide to the Galaxy' series, the line "How many roads must a man walk down?" is chosen to be the question to the answer of 42 after they realized they didn't know the question and only their answer.

Anywho, it is one of the best songs ever created so... yeah.

-=The Prynce