This is my very first tab so I hope it works.
It's a corrected version of br33dl0v3's tab. I found some mistakes and things that 
didn't sound that great.

half step down

C#m7  - X46600
Asus2 - X02200
E     - 022100
Bsus4 - X24400
Ab    - 466544
F#m   - 244222


[Intro]

C#m7   Asus2   E   Bsus4


[Verse 1]

C#m7           Asus2
Today could've been the day
           E          
that you'd blow out your candles
        Bsus4
make a wish as you closed your eyes
C#m7           Asus2
today could've been the day
     E
everybody was laughing
Bsus4
instead I just sit here and cry


[Pre-Chorus]

C#m7
Who would you be
Asus2               E
What would you look like
                   Bsus4
When you looked at me
        Ab         C#m7
for the very first time?
               Asus2   
Today could've been the next day
               Bsus4
of the rest of your life


[Chorus]

Asus2          E
Not a day goes by
             Bsus4
that I don't think of you
Asus2             E
I'm always asking why
           Bsus4
this crazy world had to lose
Asus2         C#m7
such a ray of light
         Bsus4
we never knew
F#m            Asus2
Gone too soon


[Verse 2]

C#m7                Asus2
Would you have been president
     E
or a painter, an author
    Bsus4
who sang like your mother
C#m7         Asus2
One thing is evident
           E
would have given all I had
          Bsus4
woul have loved you like no other


[Pre-Chorus]

C#m7
Who would you be
Asus2           E
What would you look like
                   Bsus4
would you have my smile
    Ab       C#m7
and her eyes
               Asus2   
Today could've been the next day
               Bsus4
of the rest of your life


[Chorus]

Asus2          E
Not a day goes by
             Bsus4
that I don't think of you
Asus2             E
I'm always asking why
           Bsus4
this crazy world had to lose
Asus2         C#m7
such a ray of light
         Bsus4
we never knew
F#m            Asus2
Gone too soon

C#m7  Asus2   E   Bsus4


[Bridge]

C#m7           Asus2   E    Bsus4
Not a day goes by
C#m7              Asus2   E    Bsus4
I'm always asking why


[Chorus]

Asus2          E
Not a day goes by
             Bsus4
that I don't think of you
Asus2             E
I'm always asking why
           Bsus4
this crazy world had to lose
Asus2         C#m7
such a ray of light
         Bsus4
we never knew
F#m            Asus2
Gone too soon

C#m7   Asus2    E    Bsus4


[Ending]

C#m7               Asus2
And not a day goes by
E                     Bsus4
that I don't think of you