Intro and Main riff:  Repeat this twice as intro

E|------------------------------------------------------------------------|
B|------------------------------------------------------------------------|
G|------------------------------------------------------------------------|
D|-----4-2-4p2---2-4-----4-2-4p2---2-----4-2-4p2---2-4--------------------|
A|--4----------4------4----------4----4----------4------------------------|
E|--2-----------------2---------------2-----------------------------------|

E|------------------------------------------------------------------------|
B|------------------------------------------------------------------------|
G|--2-2-2-2--4-4-4--------------------------------------------------------|
D|--2-2-2-2--4-4-4--------------------------------------------------------|
A|--0-0-0-0--2-2-2--0-----------------------------------------------------|
E|------------------------------------------------------------------------|

Verse:  Below note the A note after 7 F# power chords.  The third time
notice no A, it just moves straight to the A power chord after 8 F#'s

  F#                F#               F#               A        B
E|------------------------------------------------------------------------|
B|------------------------------------------------------------------------|
G|------------------------------------------------------------------------|
D|------------------------------------------------------------------------|
A|--4-4-4-4-4-4-4----4-4-4-4-4-4-4----4-4-4-4-4-4-4-4--7-7-7-7--9-9-9--7--|
E|--2-2-2-2-2-2-2-5--2-2-2-2-2-2-2-5--2-2-2-2-2-2-2-2--5-5-5-5--7-7-7--5--|

Chorus:

F#                 A       B
Maybe down by the old oak tree
F#                            A    B
They'll cut my hair when they bury me
F#             A      B
Pack me up and set me out to sea


Then return back to main riff and repeat verses and riff and chorus as
necessary.

The guitar/harmonica solo/break thing just repeats the F#, A, B progression
with some basic and simple stuff going on over top which I'm not going
to tab.