This is Ian Axel's new project A Great Big World's version of his song "Say Something".
 http://agreatbigworld.com/
The version appeared on "So You Think You Can Dance" on 9/3/2013.
It's SUUUPER simple in drop d and sounds lovely with a piano backing.

Tuning: Drop D

Chords (DADGBE): B (999---) G (555---) D(000---) A(777---) F#(444---)

(INTRO) B G D A x2

B                G                D        A 
  Say something, I'm giving up on you.
B              G                  D        A 
  I'll be the one, if you want me to.
B           G                    D         A
  Anywhere, I would've followed you.
B                G                D        A 
  Say something, I'm giving up on you.

    D                F#            
And I am feeling so small.
        G
It was over my head
                  D     A
I know nothing at all.

    D                   F#  
And I will stumble and fall.
            G
I'm still learning to love
                 D     A
Just starting to crawl.

B                 G                D       A 
   Say something, I'm giving up on you.
B                 G                  D     A 
   I'm sorry that I couldn't get to you.
B            G              D      A
   Anywhere, I will follow you.
B                 G                D        A 
   Say something, I'm giving up on you.


    D                  F#  
And I will swallow my pride.
            G
You're the one that I love
                   D        A
And I'm saying goodbye.

B                G                D        A 
  Say something, I'm giving up on you.
B              G                  D        A 
  I'll be the one, if you want me to.
B           G                    D         A
  Anywhere, I would've followed you.
B                G                D        A 
  Say something, I'm giving up on you.

Say something, I'm giving up on you.
Say something...