the ska chords: F   F  D#  rock chords: F  D# F  G  D  A
E|----------| e:------------------
B|-3---5--3-| b:------------------
G|-4---5--3-| g:------------------
D|-5---5--3-| d:----3--5--7-----9-
A|----------| a:-5--1--3--5--7--7-
E|----------| e:-3-----------5----

the majority of the ska parts of the song are a ska rhythm that goes 
G G C C and so forth.  the only exception is right before the trombone 
solo, the section goes G G Bb Bb.  Real difficult, I know.

the first rock section (oowee, girl, oowee, girl...) goes: G Bb G Bb
then (really ain't no time to waste...) it goes: C D (x4) G  C C D

the second rock section (it's so nice...) goes: A D (x3) A D E A

the only other deviation from the G G C C ska part is where, real 
slowly, Aaron sings "Nowadays, the songs..."  For that, strum a full 
C and D chord at the appropraite parts.

F             G                     F              G
Nowadays, the songs on the radio all, all drive me crazy