Favorite Spiral Knights Music!

As the title says, what's your favorite Spiral Knights music?
Example:
Random_SK_Fan(do not know if that's a real name): My favorite music is the fire theme one.
I really like the new lichen colony theme. Seems to fit the level well. (though it could work for any level except beast, undead, and fiend imho)

The "Creepy" Themes( Ghostmanes, Arkus Battle, The pre battle of Cakeastrophe).

Unfortunately I don't even listen to the ingame soundtrack anymore, and I don't do shock levels anyway.

Construct. The music you find in deconstruction zones.
http://www.youtube.com/watch?v=ILPzXNlrID0
I don't know why but I love this track so much.

IMF and that chiptuney battle theme. <3 chiptunes.

Beast stratum music, mettle of a gremlin, and BN music.

Im surprised no ones said unknown passage yet.
Absolutley love Unknown Passage and its music <3.
Oh and I like Battle Citadel and new Lichen Colony Music as well.

Royal Jelly palace!
I also like the unknown passage's theme, but I like more the danger music. For example in arenas! :3

Personally, I love the music that plays whenever a major fight starts

I have several themes i really like, but i can't decide! Theres the one Iron-Blast said, Unknown Passage battle theme, Whitespace Swarm, (http://www.youtube.com/watch?v=zBnsYC4hHZM), the boss theme,but more importantly the currently unused Boss 2 theme (http://www.youtube.com/watch?v=HISs7PAzMVQ&feature=relmfu), Creepy Battle, Arkus' battle theme (http://www.youtube.com/watch?v=Fv3iaMscAOQ), but really, i think the winner is the Main Theme, the one before bosses and the intro level. It sounds so epic! (http://www.youtube.com/watch?v=3LA5jRMSPHc&feature=related). Whitespace Swarm comes to a very close 2nd, it sounds so awesome with the old retro notes in it.

That...that....unused boss theme 2...
I didn't even know that existed. But that joins the list.

Boss theme 2 is added to my list as well.
-entering rage mode- SK U53 DI5 MU5IC 41R34DY

Main theme (and its remake played in crash site), slime, fiend, city, hall of heroes and comlink (all versions).

Oh well. No one said anything about The music in Treasure vault. :( Its just awesome.
Then, theres the 2 musics in Aurora Isles and Jigsaw Vallew. Both Awesome. OwO
WOOO Unknown passage.
Main theme FTW.
Battle 2 is good. Battle 1 too.
ALL TOO AWESOME.
Slime music is good now.
These are my favs.
But my Favourite. Is "Cradle". (Title music)

But I have to go with Title, Mission Screen/Ready Room or Fiend.

The whole OST is soooo good. Between Shock and its epic pianos, Poison and its sickeningly good instruments, Gloaming Wildwoods and its ever generically nostalgic piece, the Boss tracks ever so raising the ceiling of epicness, the otherworldly Swarm tracks, Fiend and its obnoxious contrast between orchestral and chiptunes, Freeze and its chilly calm music, Treasure Vault's which may be relaxing to some and trolololol to others, the new Jelly music that sounds like an hybrid between Zelda Minish Cap and Pokemon Mystery Dungeon music, Lockdown and Blast Network and its extremely epic Sudden Death versions, ...
So much to talk about them...
EDIT: Harry Mack, you're such a genius. Your SK music tracks are like masterpieces to me. Maybe Jun Senoue will look them up and tell you what he thinks about them, since OOO is now affiliated with SEGA.

I would say Unknown passage or sanctuary because seriously they are just epic especially when you are actually in shadow lair

I'll just name the song files:
battle_1
battle_2
fiend
main_theme
munitions
shock
title
And my absolute favorite: whitespace_swarm (even thinking about it gives me shivers, it's that epic)
Whitespace Swarm and Main Theme. In fact, the only time I stop my personal music and turn on SK is when in the Unknown Passage. I always imagine my knight fighting in step with the beat.
...Not that the other tracks are bad, FAR from it, but I do prefer my own junk usually since mine varies rather than loops.

The music in the last 30 seconds of lockdown :3
I love the music for IMF personally