Dungeon Crawl

The Dungeon Crawl Song is sung in the episode "Vault of Bones" from Adventure Time Season 5, when Finn takes Flame Princess to explore a relaxing dungeon to have some fun :D Here are Dungeon Crawl Song's lyrics:

Dungeon Crawl
It's the greatest crawl of all
No crawl's too small
For a Dungeon Crawl
Dungeon Crawl
It's the greatest crawl of all
We're goin' back to where we were
It's a Dungeon Crawl 

Adventure Time: Dungeon Crawl Song, video from Youtube:

Computer Song

Everyone loves chiptunes! In the episode  Guardians of Sunshine from Adventure Time Season 2, Finn and Jake enter in BMO's videogame and while they are digitalized, they sing this nice 8-bit style Computer Song :D Here are Computer Song's lyrics:

Finn: We are in the computer world.
We're computer boys, not computer girls.
Jake: In a game, I can be who I virtually am.
Finn: I can walk and sing, I can kill Silly Sam.  

Adventure Time: Computer Song, video from Youtube:

Decorating Song

Decorating Song is played by Finn and Jake in Adventure Time Season 2, in the episode "Her Parents", when Jake tries to look like a Rainicorn because of Lady Rainicorn's parent. Here are Decorating Song's lyrics:

Finn and Jake: Ketchup! Mustard! Red and yellow!
Jake: Lady's parents, I say hello!
I'm the fellow for your daughter
Please forget the wartime slaughter!
Home improvement, decorations.
Help me impress her relations.
Finn: Sugar bears, and rainbow jelly.
Jake: Spread those colors on my belly!
Finn: On the floor and up the log.
Jake: Please don't notice I'm a dog!

Adventure Time: Apple Decorating Song, video from Youtube:

The Hero Boy Named Finn

The Hero Boy Named Finn is a song from Adventure Time Season 1, episode Freak City, in which Finn became a giant foot because of a spell from the Magic Man! Yep, it's kinda a problem, especially when you need to find a single giant shoe. Here is The Hero Boy Named Finn's lyrics:

Finn: Is this really my life?
Is this how my story ends?
Bein' in this body,
Seems like a battle that I cannot win.
Maybe I should lay my head down slow,
And sleep until it's all ova,
Is this the end,
of the hero boy named Finn?
Heck no! Darn it, no!
This isn't how I go!
I'm gonna kill it! I'm gonna kick life's butt,
And win it, to win it.
I'm gonna take life's name,
And spit on it, and kick it!
Life can just go eat it,
'Cause this is a man's game!
Finn: Get up, Gork!
Gork: Huh? Why?
Finn: I'm not gonna let you lie here,
And waste away,
You better get up, Gork, or I'll kick you up,
Today's the day!
Gork: Whoa. Okay man, just be cool.
Finn: And I'm not gonna be cool!
'Cause I'm pipin' hot!
Get up, Trudy! Get up, Kim!
I'm not gonna let you rot!
'Jake: 'Hey, Finn.
Finn: Ja-a-a-ke, stop tellin' me to enjoy, bein' a foot, and get out of that trash!
Jake: Heh heh. I can't take you seriously when you're singing, man.
Finn: Get up! All of you make me sick!
I'll fix you with my kicks!
Gonna reconstruct y'alls self worth,
Brick by emotional brick. 

Adventure Time, The Hero Boy Named Finn Song, video from Youtube:

Never Ending Pie Song

This is the song called "Never Ending Pie", from Adventure Time Season 1 episode "What is Life", in which Finn sings while creating his marvelous Neptr robot that will throw pies to Jake forever and ever! But who would not have a machine that bake never ending pies?  Here is The 8 Glasses Song's lyrics:

I'm gonna build me a pie throwin' robot
That throws never ending piii-ies
On Jake's ugly faaa-ace
And he won't know what hit him
'Cause the pies are
N-n-n-n-never... n-n-n-n-never
N-n-n-never... ending!
It's never ending pie throwing time!

Adventure Time Never Ending Pie Song, video from Youtube:

Key Song

This is Key Song, from Adventure Time Season 1 in episode "Dungeon", when Finn the human sing about his love for finding keys.. who doesn't love to find their lost keys? :D Here is Home Song's lyrics:

Oh, key.
We're meant to be.
I want to have
Your baby.
Oh, key you're so good to me. 

Adventure Time Key Song, video from Youtube:

Cave Song

This "Cave Song" is just a short song that Finn and Jake sung in Season 1, episode Evicted!, when they finally find a cave to built their new house ;P Even if it's just 5 seconds long, it's a good song :D Here is Cave Song's lyrics:

So they cleaned the cave and built a house inside the cave. 

Adventure Time: Cave Song, video from Youtube:

House Hunting Song

This is the song called "House Hunting Song" or even "Oh Marceline", from Adventure Time Season 1, in the episode"Evicted". When Finn and Jake need to find a new home (because of Marceline!), they walk around the Land of Ooo while this song plays in the background. Here is House Hunting Song / Oh Marceline's lyrics:

So Finn and Jake

Set out to find a new home.

It's gonna be tough

For a kid and a dog on their own.

Here's a little house,

Aw, Finn's stickin' his foot in.

Well, that's a bad idea dude

Cause now that bird thinks you're a jerk, Finn!

And now they're chillin' on the side of a hill!

And thinkin' livin' in a cloud'd be totally thrillin'

Unless they find something inside

Like a mean cloud man and his beautiful cloud bride.

A beehive, oh nooooooooo!

Don't put your foot in there, guy!

Y'all tried that before,

And you know it didn't turn out right!

Big shell, go inside.

Look around, it seems alright.

Frog jumps out, and barfs a tiger!

Throwin' down potions for food and fire!

You know you should have stayed

And fought that sexy vampire lady.

Jake was feeling terrified,

He was super scared of her vampire bite.

Which is understandable

'Cause vampires are really powerful.

They're unreasonable

And burnt out on dealing with mortals.

Oh, Marceline,

Why are you so mean?

Marceline: I'm not mean, I'm a thousand years old,

And I just lost track of my moral code.

Oh Marceline,

Can't you see these guys are in pain?

Marceline: No I can't,

I'm invested in this very cute video game.

So there go our boys,

walkin' on the icy ground.

Headin' towards their destiny,

I'm sure they'll figure something out.

Adventure Time Song: House Hunting / Oh Marceline, video from Youtube:

Baby

Baby is a song from Adventure Time Season 1, episode "The Jiggler" sung by Finn the human with an auto-tuned voice, because it seems that he once eaten a little computer. Here is Baby's lyrics:

Finn: Baby, (Jake: Ooo!)
Finn: I know what you need, (Jake: What's that?)
Finn: You want your little baby socks...
for your little baby feet. (Jake: Woooo.)
Finn: Baby, (Jake: Yeah?)
Finn: I know what you crave, (Jake: Oh yeah? What's that?)
Finn: You want to poop your pants all day long,
well baby behave!
Finn: Baby... you lookin' so good,
You lookin' like you might... want some baby food. (Jake: Keep it goin', man!)
Finn: Baby, you lookin' so fine.
You lookin' like you might... just start cryin'.
Finn: I gotta tuck you in, girl.
I gotta sing you sweet melodies about babies, yeah!
(Jake: Little baby feet!)

Adventure Time Song: Baby, video from Youtube: