Riff:
E|-----------------------------------------------------|
B|-----------------------------------------------------|
G|------------5---5---| (7)-(5)-------------------------|
D|---5---5/7------------------(7)----5-7---7-------5---|
A|-7-------------------------------7-----------5/7-----|
E|-----------------------------------------------------|
Riff first variation:
E|---------------------------------------------------------|
B|---------------------------------------------------------|
G|-------------5--5-(7)(7)-(5)-----------------------------|
D|-(5)---5-7---------------------(7)(5)---5-7--7-------5---|
A|--------------------------------------7----------7/5-----|
E|---------------------------------------------------------|
Riff second variation:
E|-----------------------------------------------------|
B|-------------------(8)^------------------------------|
G|-------------5-5---------(5)-------------------------|
D|-(5)---5-7------------------(7)----5-7-----------5---|
A|--------------------------------7-----------7/5------|
E|-----------------------------------------------------|