okay, so I submitted version 2 chords for
regular Hum The Tune, then I got the album
and realised that it's a different version 
on there so... I'm gonna submit it here as 
the acoustic version. Tabbed from the 
chords that Ed told me via Youtube comment. :P

Standard Tuning with a capo on 5TH FRET.
All chords are relevant to capo.

Chords Used:
Am - 012300
C - 010230
G - 300023
F - 012300/ 112331

Intro: Am, C, G x2

Verse 1:

Am (x02210@1)           C (x32010@1)               G (320003@1)
Sometimes you write a song that you can't sing
Am (x02210@1)                      C (x32010@1)                     G (320003@1)       
'cause the subject matter raises something that you kept in the dark
Am (x02210@1)  C (x32010@1)               GWell (320003@1)maybe you'll sing her name
G (320003@1)       Am (x02210@1)            Cmaybe (x32010@1)it doesn't really matter what you say
G (320003@1)                                         Fbecause (133211@1)you've said now you can't sing it out loud

Chorus:
Am (x02210@1)               C (x32010@1)       GIf (320003@1)it needs to be said then say it
                             GIf (320003@1)it needs to be sung don't hesitate
Am (x02210@1)                    CBut (x32010@1)if you wrote it and now you regret it 
      G (320003@1)    
well hum the tune
Am (x02210@1)     C (x32010@1)      GNa (320003@1)na na na na na na
Am (x02210@1)     C (x32010@1)      GNa (320003@1)na na na na na na

Verse 2:
Am (x02210@1)                    C (x32010@1)             GThis (320003@1)is a song for the ones who feel betrayed
Am (x02210@1)             C (x32010@1)        GBut (320003@1)not enough to lose her friends
Am (x02210@1)                         C (x32010@1)               G (320003@1)
A song for the ones with a hidden past who kept it in the dark too long

Pre-Chorus:
Am (x02210@1)                   C (x32010@1)               GThis (320003@1)song's about the girl that doesn't know that he's in love with her
Am (x02210@1)                     C (x32010@1)                 FAnd (133211@1)the boy who doesn't know she loves him too

Chorus:  (x2)
Am (x02210@1)               C (x32010@1)       GIf (320003@1)it needs to be said then say it
                             GIf (320003@1)it needs to be sung don't hesitate
Am (x02210@1)                    CBut (x32010@1)if you wrote it and now you regret it 
            Gwell (320003@1)hum the tune  (hum it now)
Am (x02210@1)     C (x32010@1)      GNa (320003@1)na na na na na na
Am (x02210@1)     C (x32010@1)      GNa (320003@1)na na na na na na

Outro:
Am (x02210@1)     C (x32010@1)      GNa (320003@1)na na na na na na
Am (x02210@1)     C (x32010@1)      GNa (320003@1)na na na na na na
Am (x02210@1)     C (x32010@1)      GNa (320003@1)na na na na na na
Am (x02210@1)     C (x32010@1)      GNa (320003@1)na na na na na na
Am (x02210@1)     C (x32010@1)      GNa (320003@1)na na na na na na
Am (x02210@1)     C (x32010@1)      GNa (320003@1)na na na na na na

^^ continue that last part till fade....