Significance of Courtney's Country Music CD

Courtney has recorded a country music CD so she does not have to listen to Jordan's rap for the whole trip. She plays this endlessly on repeat, and Jordan does not object because he knows he has really hurt Courtney by breaking up with her. Later, when he gets annoyed at the thought of her being with Lloyd, he switches to the radio and puts his own music on. Determining what music is played and at what volume becomes a power play between the two.