Tenar, you’re not. Check the first reply to this thread.
""Freedom isn’t free
No, there’s a hefty f****in’ fee
and if you don’t pitch in
your buck-oh-five, who will?
Yeah, Freedom costs a buck-oh-five"
–Team America: World Police
Ok, seriously, tho’: what first came to mind is “Free” by VAST.
"It’s time to laugh, it’s time to cry
It’s time to be what you need to be
It won’t be long 'till they are gone
And we can be what we want to be
I’m gonna run from everything
Everything that holds me down
Nothing to win, nothing to lose
You can’t tell me what to do anymore
You can’t tell me what to do anymore
Now I’m free, now I’m free, now I’m free"
The rest of the lyrics are here.
Hope that helps 
bamf
Couple of songs by The Eagles: Desperado and The Last Resort .
Your best source for freedom songs is anarchist filksinger Leslie Fish – a card-carrying member of the anarcho-syndicalist Industrial Workers of the World (Wobblies).
You can find some of her lyrics here: Leslie Fish's Filksongs
And some of her songs on MP3 here: http://leslie-fish.clan-majere.org/mp3list.html.
And you can order her CDs from here: http://www.random-factors.com/fish.htm
(All the following lyrics are partial and incomplete)
“Bring It Down”:
We don’t like this world we’ve made
Bring it down, bring it down!
We’d take World War III in trade
Bring it down, bring it down!
Risk the horror in the midnight sky
The rain of Hell as the ashes fly
Just so long as the generals die!
Bring it down, bring it down!
Bring it down, bring it down!
We don’t like society
Bring it down, bring it down!
No one here is really free
Bring it down, bring it down!
Freedom’s dream has fallen far
A million rules have dimmed its star
We don’t like the way we are
Bring it down, bring it down!
Bring it down, bring it down!
“Freedom Road”:
Did you think some messiah
Coming down the pike
Could give us all one answer
As if we were all alike?
A messiah cannot save you
You should’ve known all along
That Jesus, Marx, and your guru
Could be wrong!
Freedom Road
Is a long haul
Freedom Road
Is a long haul
But it’s worth the ride
Even if
You never get there at all!
“Jefferson and Liberty”:
The night of fire is yet to come
The tyrant’s shadow down the years
Demands we kneel, or take the gun
And go shed blood instead of our tears
So rejoice, Columbia’s sons, rejoice
To tyrants never bend the knee
But pledge your heart and hand and voice
To Jefferson and liberty!
<snip>
The starry banner that did fly
O’er freedom’s bloody barricade
Now flaps and fades in foreign skies
O’er palaces that empire made
So arise, Columbia’s sons, arise
Arise, and you might yet be free
Cast off the forces that made lies
Of Jefferson and liberty!
“The Wheel”:
There’s turning on muddy ground
Gains an inch every time it goes round
Come on, let’s make another revolution
Turn, turn, turn
Turn, turn, turn
There are wheels that run
Through all of our lives
And we sometimes see them clear
When the night comes down
When the first snow falls
You can mark the day or the year
The circle’s end we can tell too easy
The beginning is hard to see
And the wheel whose season
No one knows
Is the turn of the tide
That can make us free
Try those on your 9th-graders, wmulax93! 
And here’s one just for you: “Teacher, Teacher” – http://www.prometheus-music.com/eli/filk/teacher.html
Here come the bureaucrat with fifty more rules
To tie your hands and take more bread from the schools,
Here comes the preacher trying hard to get in,
He wants all children taught his pet brand of sin.
Here comes the government with plenty to say;
It wants your children taught to serve and obey;
Here comes the school board, and that’s worst of all
They want the teachers taught to cave in and fall!
Teacher, teacher, you know what you’ll find,
They want their thumbprints stamped on everyone’s mind;
The kids suspect it and resent it like hell,
And all too often they suspect you as well.
Teacher, teacher, tell me how can you teach
When all the grownups only want you to preach?
How can you teach the kids to think for themselves
With all the censors stealing books off the shelves?
“I will fight
for my right
to live in freeeeedom!” _Paul McCartney.
“Freedom of choice
is what you’ve got
Freedom from choice
is what you want.” - DEVO
How about Looking for Freedom from the great David Hasselhoff? 
What?
Why is it I’m the first to mention Freedom by Richie Havens?
Actually, that’s a song about a short-lived female pro Tennis league that was started here in the US during the mid-70’s. The Philadelphia Freedom was one of the teams which had Billy Jean King’s involvement in it somehow.
Or something like that…
Two of the most powerful songs that come to mind are both by Peter Gabriel
Biko - about the death of Stephen Biko who faught apartheid in South Africa. Sample lyric:
You can blow out a candle but you can’t blow out a fire
When the flame begins to catch, the wind will blow it higher
Wonderful metaphor for the power of the people.
The other song is Wallflower off of his 4th album - the first 4 were all called “Peter Gabriel” - this one also had Shock the Monkey on it.
This is a song about political prisoners. I don’t have the lyrics immediately in my head but they wish the prisoners strength and tell them that they don’t stand alone.
Both are wonderful, powerful songs.
Well, it’s pretty far from hip-hop, but I immediately thought of Bob Dylan’s Chimes of Freedom link
KBC Band (Kantner-Balin-Cassidy Jefferson Airplane alums) - America 1986
Try “Freedom” by Richie Havens. In fact, that song and 66 others you’re looking for can be found here.
I don’t have any specific song titles to share, but thought you might find this site interesting and/or useful: http://www.sbgmusic.com/html/teacher/reference/historical/freedom.html. It talks about the history of “protest” and “freedom” songs in America, and gives some examples you might be able to use.
Well, I’m useless as a resource for hip-hop, but the (brief) lyrics to “Find the Cost of Freedom” by Crosby, Stills and Nash might be very fitting right now:
Find the cost of freedom
Buried in the ground.
Mother Earth will swallow you.
Lay your body down.