The whole song just repeats a 4 measure chord progression of Bb5 , C5 , and Ebm.
 
 Bb5 C5 Eb5
 | --5-----7-----6-- | 
 | --6-----8-----7-- | 
 | --7-----(b9)----8-- | 
 | --8-----10----8-- | 
 | ----------------- | 
 | ----------------- | 

               Bb5
Uh, was always smart-mouthed and quick-witted
                         ( Bb5 )
But somethin' was always missin' like six digits
                     C5
Lucky seven probably poppa
                     Eb5
Little nigga so they picked on him , hassled him
Bb5
Things changed when I hassled back, so
      (repeat) Bb5
David hit the...


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