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Chord diagram for E
Chord diagram for D
Chord diagram for A
      
Downtown by Neil Young
as performed by Neil Young and Pearl Jam on the CD "Mirrorball"
Okay, I just got this CD yesterday and this song seemed very simple.
It consists entirely(minus the lead fills) of this riff:
E D A
E--------2---------------| B--------3--2--2-2-2-2---| G-----1--2--2--2-2-2-2---| D-----2-----2--2-2-2-2---| A-----2------------------| E--0--0------------------|

That's it!
To go along with the chords E D A as posted by another poster :),
Add C B A for that chorus bit or whatever it's called.
For improvising those solos and fills try the 2nd string 12 fret and
2nd string 10 fret area. Also the 1st&2nd string 3rd and 5th fret area
is a good spot to mess around during this song.
Duncan

Source: http://www.azchords.com/n/neilyoung-tabs-2721/downtown-tabs-496583.html

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