NBA star LeBron James is one of the most famous athletes in the world, so it's not surprising that he's gracing the cover of the new issue of ESPN the Magazine. What is unusual is the guy standing next to him: producer and hip hop artist Dr. Dre. 

The story inside details how James' helped make Beats by Dr. Dre headphones, which were developed by Dre with record executive Jimmy Iovine, the must-have audio accessory for pro athletes. Now, as ESPN contributor J. Freedom Du Lac explains, Beats have captured more than half of the $1 billion market for headphones.

Plus: consumer electronics company Monster Cable once manufactured the popular headphones, but Beats recently announced the two companies were parting ways. Now, Monster has lined up another celebrity producer. Can Swizz Beatz repeat the success of Dr. Dre? Forbes writer Zack O'Malley Greenburg joins us to talk about his recent story.