Here are the chords of Rainbow by Jessie J. I'm not sure if it's the same chords 
as in the song but it sounds good :)

Verse 1:
Em (022000@1)He grew up in the city
EmHad (022000@1)a lot of money
EmSponging (022000@1)off his daddy all the time
EmHe (022000@1)lives in a bubble
EmNever (022000@1)had to struggle
EmHe's (022000@1)far from the benefit line

Pre-Chorus:
             C (x32010@1)      G (320003@1)But he feels blue sometimes
       Em (022000@1)                  D (xx0232@1)   
And he blood bleeds red like mine
             C (x32010@1)                  GThe (320003@1)grass is greener on the other side
         Em (022000@1)                DWhat (xx0232@1)I'm saying is we're all alike

Chorus:
                          Em (022000@1)       CWe're (x32010@1)the colours of the rainbow (yeah, yeah)
       G (320003@1)              DLet's (xx0232@1)share our pot of gold
                         Em (022000@1)        CWe're (x32010@1)the colours of the rainbow (yeah, yeah)
       G (320003@1)                       DEverybody's (xx0232@1)on the yellow brick road
                   Em (022000@1)            CThere's (x32010@1)enough for you, you, you
                   G (320003@1)            DThere's (xx0232@1)enough for me, me, me
                         Em (022000@1)        CWe're (x32010@1)the colours of the rainbow (yeah, yeah)
                          G (320003@1)        DWe're (xx0232@1)the colours of the rainbow (yeah, yeah)
Rainbow [x7]

Verse 2:
EmThere's (022000@1)mummy in the ghetto
EmGotta (022000@1)work it double
EmJust (022000@1)to pay the bills and get by
EmBut (022000@1)more power to ya
EmYou're (022000@1)doing what you do-a
EmEverybody's (022000@1)steady on the grime

Pre-Chorus:
             C (x32010@1)       GBut (320003@1)you feel blue sometimes
           Em (022000@1)                  DAnd (xx0232@1)you're blood bleeds red like mine
             C (x32010@1)                  GThe (320003@1)grass is greener on the other side
           Em (022000@1)                DWhat (xx0232@1)I'm saying is we're all alike

Chorus:
                           Em (022000@1)        CWe're (x32010@1)the colours of the rainbow (yeah, yeah)
      G (320003@1)              DLets (xx0232@1)share our pot of gold
                          Em (022000@1)          CWe're (x32010@1)the colours of the rainbow (yeah, yeah)
      G (320003@1)                       DEverybody's (xx0232@1)on the yellow brick road
                    Em (022000@1)             CThere's (x32010@1)enough for you, you, you
                    G (320003@1)          DThere's (xx0232@1)enough for me, me, me
                          Em (022000@1)       CWe're (x32010@1)the colours of the rainbow (yeah, yeah)
                          G (320003@1)        DWe're (xx0232@1)the colours of the rainbow (yeah, yeah)

Bridge:
C (x32010@1)          GHello, (320003@1)hello
          Em (022000@1)             DWhy (xx0232@1)does everybody get so mad?
C (x32010@1)          GYellow, (320003@1)yellow
          Em (022000@1)                       D (xx0232@1)    
It's the colour for the battle in my head
       C (x32010@1)                  G (320003@1)       
I need pink in my life like love in my heart
Em (022000@1)                                  DSilver (xx0232@1)in the sky as we rock with the stars
C (x32010@1)               G (320003@1)          EmWe (022000@1)just cant keep fighting anymore
DNo, (xx0232@1)no, no

Chorus:
                         Em (022000@1)        CWe're (x32010@1)the colours of the rainbow (yeah, yeah)
      G (320003@1)              DLets (xx0232@1)share our pot of gold
                          Em (022000@1)          CWe're (x32010@1)the colours of the rainbow (yeah, yeah)
      G (320003@1)                       DEverybody's (xx0232@1)on the yellow brick road
                    Em (022000@1)             CThere's (x32010@1)enough for you, you, you
                    G (320003@1)          DThere's (xx0232@1)enough for me, me, me
                          Em (022000@1)       CWe're (x32010@1)the colours of the rainbow (yeah, yeah)
                          G (320003@1)        DWe're (xx0232@1)the colours of the rainbow (yeah, yeah)