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|