This is my first tab.  My Favorite Song by David Gray.  Super easy to sing along too.  I 
charted out the whole thing, but in general, you are usually playing one of the two progressions:

G , D , C , Am
Em , D , C , Am

For variety, go ahead and switch the order of C and Am every now and then.

Cap on 1st Fret


G
Come on, come on, come on
                  D
come on, come on, come on
C
Come on, come on, come on
                  Am
come on, come on, come on

      G
The stolen glances, broken threads
      D
The visions looming in our heads
      C
The years spent running parallel
     Am
To everything that might of been
    G
No longer possible to hide
    D
The feeling welling up inside
      C
Ain't never been this close before
            Am
Ain't never felt so far away

       G
When a moment
  D
A moment changes everything
       C
When a moment
  Am
A moment changes everything
       G         D            C
When a moment, it changes everything

     G
The summer sky is blushing pink
      D
The heart is running out of sync
      C
Could this just be the day, I think
      Am
When anything is possible
      G
Well, hey now you've been here before
   D
To see your face and slam the door
    C
And waiting for the floor to drop
 Am
Feel like time is standing still

       G
When a moment
   D
A moment changes everything
       C
When a moment
   Am
A moment changes everything
       G
When a moment
    D
A moment changes everything
       C
When a moment
  Am
A moment changes everything
        Em         D             C
When a moment, it changes everything

G
Come on, come on, come on
                  D
come on, come on, come on
C
Come on, come on, come on
                  Am
come on, come on, come on

G
Come on, come on, come on
                  D
come on, come on, come on
C
Come on, come on, come on
                  Am
come on, come on, come on

   Em         D
A moment, a moment changes everything
   C          Am
A moment, a moment changes everything
   Em         D
A moment, a moment changes everything
   C         Am
A moment, a moment changes everything

     Em        D
Then moment, a moment changes everything
  C                 Am                  Em
A moment