this is a good songa and its really easy certainly for a Xmas do!
the verse is;
[Ab]until you sing 2nd XMAS then [Eb]
you may want to fiddle with these chords to make it sound more rocky!
I simply use barre chords and barre across with my little finger every other beat
now the middle 8 is very melodic but not too hard if you keep to barre chords.
[Db] until SENTIMENTAL then [Cm]until VOICES then [Fm]until DECK then
[Bb] until BELLS then back to [Eb] to start the verse again.
easy and effective but you have to liven it up anyway.