Hip-Hop Turns 50 I

Deals and Steals on Wheels in Dallas with ABC e-commerce editor Tory Johnson and businessman Mark Cuban; "GMA" kicks off Hip-Hop Turns 50 series; ABC News contributor Kelley Carter interviews rapper Offset; rapper and author Jay "Jeezy" Jenkins talks about his new book and performs in Times Square ("Adversity for Sale"); surprise musical guest joins Jeezy for a live performance.