TappinCastlefan said:

Train – Hey, Soul Sister!  Without a doubt!

Yeah! Agree 100 %  

The songs of Lady Antebellum too  Here quite a few songs and I'll look for more :

Extraordinary- Mandy Moore (I laugh when I saw the title, maybe fits a little bit for Beckett, some quotes  idk lol)

Your Guardian Angel Lyrics – The Red Jumpsuit Apparatus 

What hurt the most- Rascal Flatts

Everything- Michael Bublé (Very beautiful  I can imagine to Castle singing this song to Beckett )

http://www.youtube.com/watch?v…..1WhcLDEEDQ

Anywhere But Here- SafetySuit

Is this the end of the moment or just a beautiful unfolding
Of a love that will never be or maybe be
Everything that I never thought could happen or ever come to pass and I wonder
If maybe, maybe I could be all you ever dreamed, cause you are…

…Beautiful inside, so lovely and I can't see why I'd do anything without you, you are
And when I'm not with you, I know that it's true
That I'd rather be anywhere but here without you

Is this a natural feeling or is it just me bleeding
All my thoughts and dreams in hope that you will be with me or
Is this a moment to remember or just a cold day in December, I wonder
If maybe, maybe I could be all you ever dreamed cause you are

Beautiful inside, so lovely and I can't see why I'd do anything without you, you are
And when I'm not with you, I know that it's true
That I'd rather be anywhere but here without you

…

What are you waiting for- Miranda Cosgrove (Castle to Beckett & Beckett to Castle )

So just make a move
You've got nothing to lose, no.

Here I am
Take a chance
What are you waiting for
I'm telling you
As a friend
We could be so much more
I never thought anyone ever could
Make me feel this way
So make my day
What are you waiting for?
What are you waiting for?

…

Two is better than one- Boys like girls ft. Taylor Swift (It's perfect! )

I remember what you wore on the first day
You came into my life and I thought
"Hey, you know, this could be something"

So maybe it's true
That I can't live without you
Maybe two is better than one
There's so much time
To figure out the rest of my life
And you've already got me coming undone
And I'm thinking two is better than one

I remember every look upon your face
The way you roll your eyes  ()
The way you taste
You make it hard for breathing

'Cause when I close my eyes and drift away
I think of you and everything's okay
I'm finally now believing

That maybe it's true
That I can't live without you
Maybe two is better than one
There's so much time
To figure out the rest of my life
And you've already got me coming undone
And I'm thinking two is better than one
Yeah, yeah

…

Crush- David Archuleta (Aww It's perfect too! )

http://www.youtube.com/watch?v…..j1Xq_8ZhDM

I searched this thread, and didn't see this one, so I apologize if it has already been posted! The song is called "What I Really Meant To Say" by Cyndi Thomson. I found it from a YouTube video found here. I LOVE this video! It's so beautifully edited, and the song is now residing in my 'Castle' playlist on iTunes!

Going through old CDs yesterday.  Found a couple more songs that made me think of Castle:

Believe in Me by Dan Fogelberg http://www.youtube.com/watch?v…..j3xzEDhDhE

Right in Front of You by Celine Dion http://www.youtube.com/watch?v…..Tm30Taxdl5

Ohhh great songs!! I love this topic!!

Here more songs that fit perfectly with Castle and Beckett:

A Lonely September by Plain White T's

http://www.youtube.com/watch?v….._QK-sXBPAA

"I'm sittin' here all by myself
just tryin' to think of something to do
Tryin' to think of something, anything
just to keep me from thinking of you
But you know it's not working out
'cause you're all that's on my mind
One thought of you is all it takes
to leave the rest of the world behind

[Chorus]
Well I didn't mean for this to go as far as it did
And I didn't mean to get so close and share what we did
And I didn't mean to fall in love, but I did
And you didn't mean to love me back, but I know you did        (I love this part )

I'm sittin' here tryin' to convince myself
that you're not the one for me
But the more I think, the less I believe it
and the more I want you here with me

…"

Fireworks by Plain White T's

http://www.youtube.com/watch?v…..wry3iJ5KGQ

"Well I don't mind waiting 'til you're comfortable with me
But what's it gonna take to prove that I'm for real? (I'm for real)
'Cause you know how I feel about you
You know I can't live without you
I just wanna stay and make it real

'Cause I know, you know
it can't get much better
Fireworks flyin' whenever we're together
I know, you know, that I know you love me

Well I've made up my mind that I want you to be the one
The one I wanna be with when I'm ninety-two

…"

All That We Needed by Plain White T's

http://www.youtube.com/watch?v…..f6bllyk0AM

"If you could come clean about everything
it would be easy for me to be sorry.
If you could see all the possibilities
we might not still be standing where we started.

Oh, no.
Don't let me go for this,
don't let me go for this.

I might be a fool, but you might be one too.
Maybe we're all that we needed.
…"

Broken Hearted-Girl by Beyonce

http://www.youtube.com/watch?v…..re=related

"You're everything I thought you never were
And nothing like I thought you could have been
But still, you live inside of me, so tell me how is that?
You're the only one I wish I could forget
The only one I love to not forgive
And though you break my heart, you're the only one
And though there are times when I hate you
'Cause I can't erase
The times that you hurt me and put tears on my face
And even now, while I hate you, it pains me to say
I know I'll be there at the end of the day

I don't wanna be without you, babe
I don't want a broken heart
Don't wanna take a breath without you, babe
I don't wanna play that part
I know that I love you, but let me just say
I don't wanna love you in no kind of way, no no
I don't want a broken heart
I don't wanna play the broken-hearted girl
No, no, no broken-hearted girl

…"