intro

repeat x4
E---------------|
B---------------|
G---------------|
D---------------|
A---0---0---0---|
E-0---0---0-----|
then: (also start the verse)
repeat something like x5 before starting the verse
it happened to...
E------------|
B------------|
G---2--2-----|
D------------|
A-0--0-------|
E------------|.....
and it alternates, go lower with the bass
(listen to see on which lines or just improvise)
E------------|
B------------|
G---2--2-----|
D------------|
A------------|
E-3--3-------|...

E------------|
B------------|
G---2--2-----|
D------------|
A------------|
E-2--2-------|...

E------------|
B------------|
G---2--2-----|
D------------|
A------------|
E-1--1-------|...

chorus:
(this i kinda improvised, you can play with it a bit to make it
  sound the way you'd want to)
and soon the leaves..
E----------------|
B----------------|
G---2--2---2---2-|
D-2--0---0---0---|
A----0---0---0---|
E----------------|...