riff goes like this: xA|--------------------|-------------------|-------------------|-------------------| xE|-0-0-0-0-0-0-0-0-|-0-0-0-0-0-0-0-0-|-------------------|-3-2-----0-------| xC|--------------------|-------------------|-2-2-2-2-2-2-2-2-|-------------------| xG|--------------------|-------------------|-------------------|-------------------| so basically: Em -> play open E string D -> 2nd fret of C string G -> 3rd fret of E string

To make it sound more like original I recommend to use barre Am and barre C chords (making bar with your index finger ofc). → Am (bar at the 2th fret) xA|-3-| xE|-5-| xC|-4-| xG|-2-| → C (bar at the 3th fret) xA|-3-| xE|-3-| xC|-4-| xG|-5-| Hope it helps someone ^^

Barre chords: → E chord (bar at the 4th fret) xA|-7-| xE|-4-| xC|-4-| xG|-4-| → D chord (bar at the 2nd fret) xA|-5-| xE|-2-| xC|-2-| xG|-2-| → A chord (4th fret) xA|-4-| xE|-5-| xC|-4-| xG|-6-| → G chord (2th fret) xA|-2-| xE|-3-| xC|-2-| xG|-4-| It is really fun to slide between E and D or A and G. Love playing that song.

I've got a short advice: if you can't play E chord, just learn it! 🙂

Bar on the 4th fret + pinky on the 7th fret on the 1st string is not a E7… it's just an barre E major. So basically it is the same as the "basic" E chord, but higher.