The intro is just the fourth fret on the A string repeatedly
E---------------------------------------------------------------------------|
B---------------------------------------------------------------------------|
G---------------------------------------------------------------------------|
D---------------------------------------------------------------------------|
A—4-4-4-4-4-4-4-4-4-4-4-4-4-4-7---4-4-4-4-4-4-4-4-4-4-4-4-4-4-7-------------|
E---------------------------------------------------------------------------|
E---------------------------------------------------------------------------|
B---------------------------------------------------------------------------|
G---------------------------------------------------------------------------|
D---------------------------------------------------------------------------|
A—4-4-4-4-4-4-4-4-4-4-4-4-4-4-7---4-4-4-4-4-4-4-4-4-4-4-4-4-4-7-------------|
E---------------------------------------------------------------------------|
E---------------------------------------------------------------------------|
B---------------------------------------------------------------------------|
G---------------------------------------------------------------------------|
D---------------------------------------------------------------------------|
A---------------------------7—4-4-4-4-4-4-4-7-4-4-4-4-4-4-4-7---------------|
E—7-7-7-7-7-7-7-7-6-6-6-6-6-------------------------------------------------|
E---------------------------------------------------------------------------|
B---------------------------------------------------------------------------|
G---------------------------------------------------------------------------|
D---------------------------------------------------------------------------|
A---------------------------7—4-4-4-4-4-4-4-7-4-4-4-4-4-4-4-7---------------|
E—7-7-7-7-7-7-7-7-6-6-6-6-6-------------------------------------------------|