Intro:
(1)
E|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|-----2-----------------4----------------6----------------------------------|
D|--0----4--(12x)-----0----5--(3x)-----0----5--(1x)--------------------------|
A|---------------------------------------------------------------------------|
E|---------------------------------------------------------------------------|

Then, play this:
(2)
E|-----5-----5--7--5---------------------------------------------------------|
B|--3-----3------------7--5--5p3--5--5--3--5--7--5--3----(4x)----------------|
G|---------------------------------------------------------------------------|
D|---------------------------------------------------------------------------|
A|---------------------------------------------------------------------------|
E|---------------------------------------------------------------------------|

You can play the riff an octave lower, like this:
(2)
E|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|----2----2--4--2-----------------------------------------------------------|
D|--0---0-----------4--2--2p0--2--2--0--2--4--2--0---------------------------|
A|---------------------------------------------------------------------------|
E|---------------------------------------------------------------------------|

After B is played, play this:
(3)
E|---------------------------------------------------------------------------|
B|----------------------------------------2----------------------------------|
G|-----2----------------2--------------------2-------------------------------|
D|--0----4--(8x)-----------4--(8x)---------------(8x)------------------------|
A|-------------------2-----------------0-------------------------------------|
E|---------------------------------------------------------------------------|
Timber, timber...         Let the forest...             Why can't I...



| /   slide up
| \   slide down
| h   hammer-on
| p   pull-off
| ~   vibrato
| +   harmonic
| x   Mute note
| b   Bend
| pb  Pre-bend
| br  Bend release
| pbr Pre-bend release
| brb Bend release bend

来源：www.cifraclub.com