The other chord versions are wrong, so I figured I'd post a corrected version.  It's a very simple tune. 
Basically, all the chords are 5 chords.

We're an American Band–Grand Funk Railroad

|D |D  |C |C  |Bb5 |C |D |C |D |D  |C |D F E C|
 
D                              C                         D   F   E C  D
Out on the road for forty days Last night in Little Rock put me in a  haze
Sweet sweet Connie doing her act She had the whole show and that's a natural fact
G            D                 C               D 
Up all night with Freddie King I gotta tell ya poker's his thing
G                D                 F                             G  
Booze and ladies keep me right  As long as we can make it to the show tonight

Chorus
          D                       C                        Bb
We're an American band We're an American band We're coming to your town 
               C                       D
We'll help you party it down We're an American band

|D |D  |C |DFEC|

Four young Chiquitas in Omaha Was waiting for the band to return from the show
Feelin' good feelin' right its Saturday night The hotel detective he was out of sight
Now these fine ladies they had a plan They was out to meet the boys in the band
The said,  "come on dudes lets get it on" And we proceeded to tear that hotel down

Chorus 2X

Solo |G |D |C |D |G |D |F |G |

Chorus 3X