This is the single intro, the earlier recordings are a bit different

e|--------------------------------------------------------------------------|
B|7/12----------------------------------------------------------------------|
G|-----12----------------12----12-------------------------------------------|
D|--------14----14-----------------14----14---------------------------------|
A|-----------15----15-12----15--------15----15-14---------------------------|
E|--------------------------------------------------------------------------|

e|--------------------------------------------------------------------------|
B|--------------------------------------------------------------------------|
G|-------------12----12----------7/12---------------------------------------|
D|-10---12--------------14--------------------------------------------------|
A|----8----10-----15-------15-12--------------------------------------------|
E|--------------------------------------------------------------------------|