In my choice of music, crooked smile by J.Cole, there are many different examples of dynamics. In the third verse of “Crooked Smile” J Cole says,
“But one more time for the ‘Ville and f*** all that beef shit, n****, let’s make a mil…”.
When he starts to rap, these lyrics the instruments in the background gets very soft. I think he did this to give more power to the words that he was saying. This is also the part in the music video when the antagonist has just shot his little sister, and he is handcuffed in the back of the police car. There is also a change in the beat again when he says
“I got money for the bail now, well now, if you asking will I tell now Hell nah I ain’t snitching cause..”
When he raps these lines he is putting inference on the the instruments in the background, especially the piano.