riff 1
G|----------------------------------|
D|----------------------------------|
A|----------------------------------|
E|--6-5-----5-----6-5---6-5---------|
riff 2
G|------------------------------------|
D|------------------------------------|
A|------------------------------------|
E|--6-5-----5-----6-5---6-5---6-0-3-0-|
riff 3
G|----------------------------------------|
D|----------------------------------------|
A|----------------------------------------|
E|--3-5-----5-3---------3-5-----5-3-------|
riff 3 variation
G|----------------------------------------|
D|----------------------------------------|
A|----------------------------------------|
E|--3-5-----5-3-3-3-3-3-5-3-----5-3-3-3-3-|