"Writer's Block" by Brother Ali.

Tight track. Brother Ali describes it perfectly in this song:

Sometimes I don’t write a lot
I know some folks call that writer’s block
I just call it my process
It comes out when it’s ready to, I guess

I don’t wanna let nobody down, so
Here’s some new shit, you tell me how it sounds
I ain’t tryin’ to be difficult or no shit
It just hurts too bad to try and force it...