Almost 100% positive that this tab is correct. I apologize if it's a little off. The 
just came out and I heard a rough recording of the song that he played on MTV. It's just a 
that he played and may differ from final version. Experiment and enjoy!

Chords

Dm - xx0231
C  - x32010
C7 - x32310
F - 133211
A - x13331
A7 - x02020

During the intro and verses...
Hammer on the e string, 1st fret, first strum only when you play the Dm chord.
Hammer on the D string, 2nd fret, first strum only when you play the C chord.

Intro:

Dm, C, F

    Dm             C           F
The day that music died was an awful day
    Dm               C       F
the children started working instead of play
    Dm              C          F
our poets read from scripts to earn their pay
            Dm         C             F
i tell them exit stage left aint got shit to say

      Dm              A                F
Cause music brings us life when we are dead
              C                C7
an honest melody to break the trend
    Dm              A               F
and music brings us hope for future peace
              C            C7
humanity will sing in harmony
  A7           Dm
I pray for that day

Harmonica part:

Dm, C, F

    Dm             C           F
The day that music died was an awful day
    Dm              C            F
the critics and the skeptics had all the say
     Dm           C            F
this money hungry industry must back away
Dm            C               F
set the music free or watch it fade away

      Dm              A                F
Cause music brings us life when we are dead
              C                C7
an honest melody to break the trend
    Dm              A               F
and music brings us hope for future peace
              C            C7
humanity will sing in harmony
  A7           Dm
I pray for that day