First part done with power chords.

Intro Bb C Bb F Bb Em F Em

C                   Bb
Jack's OK, and he's back, OK
         F
He's all right
                     Em
Let's shout, make a fuss
Scream it out.
 
C                 F
Jack is back now, everyone sing
Bb             Em
In our town of Halloween   (End power chords)

Ebm
 
        Ebm
What is this?
        F#
What is this?
                Abm
I haven't got a clue
                    F#
Why it's completely new
                    B
Must be a Christmas thing
                 C#
It's really very strange
             D/C#
This is Halloween
        Ebm
This is Halloween

Abm

           Abm                  E
My dearest friend, if you don't mind
            B        F#      E
I'd like to join you by your side
             B      F#     E
Where we can gaze into the stars
 
        B        F#        E   B
And sit together,  now and forever
          B        F#         E
For it is plain as anyone can see
                      B
We're simply meant to be


G-4-3-1----------------------
D-------4-2-4----------------