The whole song works around this chord progression:
[ Tab from: http://www.guitaretab.com/e/ernie-halter/250632.html ]
Dmin7 C#min7 Cmin7 A#7 A7
E|-x-------x------x------6----5-|
B|-10------9------8------6----5-|
G|-10------9------8------7----6-|
D|-10h12---9h11---8h10---6----5-|
A|-x-------x------x------8----7-|
D|-10------9------8------6----5-|
The hammer-on for the first three notes essentially removes the 7th from the chord. If
want you can add a bit of percussion in between the first three notes to pad it out a
and that's pretty much it!
