the riff is in the intro and the chorus just a F chord in open E tuning ridden up to 
the 5th fret

"watch! out! the madness of the crowds etc etc

E|1-2-3-4-5|1-2-3-4-5|1-2-3-4-5|1-2-3-4-5|
A|3-4-5-6-7|3-4-5-6-7|3-4-5-6-7|3-4-5-6-7|
D|3-4-5-6-7|3-4-5-6-7|3-4-5-6-7|3-4-5-6-7|
G|2-3-4-5-6|2-3-4-5-6|2-3-4-5-6|2-3-4-5-6|
B|---------|---------|---------|---------|
e|1-2-3-4-5|1-2-3-4-5|1-2-3-4-5|1-2-3-4-5|

E|1-2-3-4-5|1-2-3-4-5|1-2-3-4-5|1-2-3-4-5|
A|3-4-5-6-7|3-4-5-6-7|3-4-5-6-7|3-4-5-6-7|
D|3-4-5-6-7|3-4-5-6-7|3-4-5-6-7|3-4-5-6-7|
G|2-3-4-5-6|2-3-4-5-6|2-3-4-5-6|2-3-4-5-6|
B|---------|---------|---------|---------|
e|1-2-3-4-5|1-2-3-4-5|1-2-3-4-5|1-2-3-4-5|