Dylan Klebold and Eric Harris were into a German/American band called KMFDM.

http://www.kmfdm.net/

The name of the band is an acronym for the German phrase Kein Mehrheit Fur Die Mitleid, which in English is, No Pity For The Majority.

http://dmoz.org/Arts/Music/Bands_and_Artists/K/KMFDM/faq.html

There were numerous reports on the day of the massacre that Eric Harris had a website that featured KMFDM lyrics.

http://www.usatoday.com/life/cyber/tech/cte995.htm
http://www.rollingstone.com/news/newsarticle.asp?afl=0001&nid=7665

There are pictures of them wearing KMFDM hats and T shirts.

http://gurlpages.com/twelve_skitzo/hp/frames/images/ericdylanbrooksrobyn.jpg

On the day of the massacre 4/20/99, KMFDM released their final album entitled Adios.

After they released Adios the band changed it's name to MDFMK.
http://www.kmfdm.net/page/news.html

The album Adios contains a song called R.U.OK?

RU OK?

That's fine with me
Don't think I care
Do what you want
As you see fit
That's quite alright
It's all ok
Just be yourself
That's fine with me

For a second you might wonder if it's real

If that's alright
Just say ok
If that felt good
Let's go again

For a moment you might question what you see
For a second your whole world will disappear

This is mind control and you know it
This will shut you up and you know it

What's wrong with you
R.U.OK?
Are you still here
don’t slip away
Just breathe in deep
And stay awake
don’t close your eyes...

That's all you get
It's all you need...

The song is a trigger that engages a mind already programmed to receive and react in a destructive way.

Here are the lyrics to the song Son of a Gun.

Shockwave - Massive attack
Atomic blast - Son of a gun is back
Chaos - Panic - No resistance
Detonations in a distance
Apocalypse now - Walls of flame
Billowing smoke - Who's to blame
Forged from steel - Iron will
Shit for brains - Born to kill
All are equal - No discrimination
Son of a gun - A simple equation
Son of a gun - Master of fate
Bows to no god - Kingdom or state

Watch out
Son of a gun
Superhero #1

All of the lyrics are full of occult symbology and phraseology.

http://www.kmfdmdogma.com/lyrics/anarchy.txt

Here are the lyrics to the song Witness. The song is in the first person view. It is about deceived Christians boarding ufo's with the demonic entities to escape destruction.

Inter planetary frequency
Alteration of destiny
Surrendering to my ultimate destiny

The spaceship will come to take us away
Out of the orbit and into the light
We're gonna be picked up and sent on a flight
Get ready to join us
Escape the destruction enjoy the abduction
Surrender Supernova

I will always praise my maker
I will always return to my taker
I will never be a faker
I will never be a forsaker

They are visiting us for their genetic testing
I don't think it's such a blessing
But then again how can I know
I must not judge so much
You know

The message I got is simple and easy
When we got on the spaceship we must not flip
We have to be fearless it helps to keep smiling
Are you ready to join us
Avoid the testing and be with the master
Surrender bend over

Immortality
Mortality
I'm a witness

These words are of demonic origin.

KMFDM - ADIOS
Track 3: D.I.Y.
Length: 4:51

A new revolution
The ultimate war
KMFDM is back for more
twice the mayhem
Triple the force
10x the action
Total Hardcore

Shanghai-Stockholm-Berlin-Tel Aviv
The world rotates to the Ultra-Heavy Beat
From the gutter to the top
KMFDM will never stop

Violence, anger and anarchy
A megaton load of toxic debris
Money, power, all you can eat
The manifestation of ultimate greed

Tokyo-Moscow-Chicago-Madrid
The World rotates to the Ultra-Heavy Beat

Rip the SYSTEM, throw it away

No legislation can stand in our way
Anti x 2 the USA
Ends with a M
begins with a K

D.I.Y. destroy what destroys you
D.I.Y. do or die
Destroy...

Notice the phrase "the WORLD rotates to the ULTRA HEAVY BEAT"?

This song was contained on KMDM's final album Adios.

After Adios, KMFDM changed their name to mdf-MK.

The MK-Ultra Heavy Beat.

Could the message be that the world revolves around Trauma based mind control?

Here are the lyrics to all the songs

http://www.kmfdmdogma.com/lyrics.shtml

It has also been reported that Eric Harris died wearing a T-shirt that said
"NATURAL SELECTION"

http://www.denver-rmn.com/shooting/0516bguy2.shtml

Here is the song Rubicon from the album Adios

KMFDM - ADIOS Track 9:
Rubicon
Length: 3:44

Cross the Rubicon, Burn the fire sign
Only victory is bliss
Bend a broken rule
Break the symmetry
Put all progress into remiss
Rinse out the ugly and purge every demon
A small step for progress a leap for the mind
The smoke never settles where everything is even
A poke in the eye the equation is nil
Violence for inner-peace
Bombing for therapy
Terror is everything you need
Cross the dotted line
Fake your destiny
Give a finger take a hand
Use the enemy
Turn the outside in
Tell the prophet it's the end
Money is power and power is corruption
There is nothing to gain from the absolute truth
Natural selection is based on deception
The ignorant elder empowers the youth...