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.