The song begins with Am kind of Am4.I play the intro like this

 | --------------e
 | --------------b
 | ------2-------g
 | ------2-------d
 | --------------a
 | ------x-------E

    Am            B7
      Get up and dance
     E                    Am
      I'm in the mood for love
     Am                B7
      I wanna see you rise and shine
     E                 Am
      On revelation's day
              Am
      We're about to explore
        B7
      About to ignore
     E                 Am 
      In such an easy way
                Am                B7
      It's the perfect cure in a perfect world
     E                 Am  Am Am4
      On revelation's day

      C    G
I'm free
    Dm       Am   Am4
At last I'm free
      C    G
I'm free
    Dm        Am  Am4
At last I'm free
C
You can't judge me
      Dm              E
Cuz' you don't know me

    Am            B7
      Get up and dance
     E                     Am
      I'm in the mood for love
           Am            B7
      I reveal your insecurity
     E                 Am
      On revelation's day
             Am             B7
      You're hanging in a puppetstring
     E                    Am
      Let me relief your pain
                   Am
      You're the driving force
             B7    
      In an overkill
     E                 Am   Am4
      On revelation's day

      C    G
I'm free
    Dm       Am   Am4
At last I'm free
      C    G
I'm free
    Dm        Am  Am4
At last I'm free
C
You can't judge me
      Dm              E
Cuz' you don't know me


      Dm
The gravity changes
            Am
Wants your love
    B7        E
At last I'm free

 Am            B7
      Get up and dance
     E                    Am
      I'm in the mood for love
     
      On revelation's day
       C          G           Dm 
      Day   -    Day    -    Day  | X2
    Am                     Am4   X2 
      On revelation's day         | X2

      C   G
I'm free                  | X2
    Dm       Am   Am4    X2
At last I'm free          | X2 
      C   G              X2
I'm free                  | X2
    Dm       Am   Am4    X2
At last I'm free

                 C 
On revelation's day