I     ii    iii IV   V     vi     VII I
/A /  /Bm/  /C#m/D/  /E /  /F#m/  /G#*/A                   

 I     ii   iii IV    V     vi     VII I
/C /  /Dm/  /Em/F /  /G /  /Am/   /B* /C       otras claves


Birthday 

    A                                       -clave de A
You say it's your birthday
     A           
It's my birthday too, yeah
     D             
They say it's your birthday
      A            
We're gonna have a good time
    E              
I'm glad it's your birthday
      A        
Happy birthday to you.

E 

E7
Yes we're going to a party party
E7
Yes we're going to a party party
E7
Yes we're going to a party party

C       G                  C                -clave de C
I would like you to dance (Birthday)
       G                   C
Take a cha-cha-cha-chance (Birthday)
        G                  C
I would like you to dance (Birthday)
G         E7
Daaaaaaaaaaance

Intrumental                                 -clave de A
A    D    A    etc

E7: V de A.