The whole song just repeats a 4 measure chord progression of Bb7M , C7M , and Ebm.
 
 Bb7M C7M Ebm
 | --5-----7-----6-- | 
 | --6-----8-----7-- | 
 | --7-----(b9)----8-- | 
 | --8-----10----8-- | 
 | ----------------- | 
 | ----------------- | 

               Bb7M
Uh, was always smart-mouthed and quick-witted
                         ( Bb7M )
But somethin' was always missin' like six digits
                     C7M
Lucky seven probably poppa
                     Ebm
Little nigga so they picked on him , hassled him
Bb7M
Things changed when I hassled back, so
      (repeat) Bb7M
David hit the...


The trumpet is only playing the arpeggio of each chord.
and that's it.