The Sorting Hats song
In times of old when I was new
And Hogwarts barely started
The Founders of our noble school
Thought never to be parted:
nited by a common goal,
They had the selfsame yearning
To make the world's best magic school
And pass along their learning.
"Together we will build and teach!"
The Four good friends decided
And never did they dream that they
Might someday be divided,
For were there such friends anywhere
As Slytherin and Gryffindor?
Unless it was the second pair
Of Hufflepuff and Ravenclaw?
So how could it have gone so wrong?
How could such friendships fail?
Why, I was there and so can tell
The whole sad, sorry tale.
Said Slytherin, "We'll teach just those
Whose ancestry is purest."
Said Ravenclaw, "We'll teach those whose
Intelligence is surest."
Said Gryffindor, "We'll teach all those
With brave deeds to their name,"
Said Hufflepuff, "I'll teach the lot,
And treat them just the same."
These differences caused little strife
When first they came to light,
For each of the four founders had
A House in which they might
Take only those they wanted, so,
For instance, Slytherin
Took only pure-blood wizards
Of great cunning, just like him,
And only those of sharpest mind
Were taught by Ravenclaw
While the bravest and the boldest
Went to daring Gryffindor,
Good Hufflepuff, she took the rest,
And taught them all she knew,
Thus the Houses and their founders
Retained friendships firm and true.
So Hogwarts worked in harmony
For several happy years,
But the discord crept among us
Feeding on our faults and fears.
The Houses that, like pillars four,
Had once held up our school,
Now turned upon each other and,
Divided, sought to rule.
And for a while it seemed the school
Must meet an early end,
What with dueling and with fighting
And the clash of friend on friend
And at last there came a morning
When old Slytherin departed
And though the fighting then died out
He left us quite downhearted.
And never since the founders four
Were whittled down to three
Have the Houses been united
And they once were meant to be.
And now the Sorting Hat is here
And you all know the score:
I sort you into Houses
Because that is what I'm for,
But this year I'll go further,
Listen closely to my song:
Though condemned I am to split you
Still I worry that it's wrong,
Though I must fulfill my duty
And must quarter every year
Still I wonder whether sorting
May not bring the end I fear.
Oh, know the perils, read the signs,
The warning history shows,
For our Hogwarts is in danger
From external, deadly foes
And we must unite inside her
Or we'll crumble from within
I have told you, I have warned you..
Let the sorting now begin

This particular sorting hats song was in the Order of Phoenix and I wonder if J.k put some clues into it obviusly shes telling us that Wizards and wiches are in danger in the next few books but I wonder if theres more like one thing I notice is it said Salazar Slitheren died maybe shes saying he died but Gryffindor Ravenclaw and Hufflepuff didn't hmmm intresting ?  What do u guys think?