that's what billy anderson living with. >> while doctors try to diagnose it, people from across the worldching out to help in many en many surprising ways. melinda roeder has tonight's cover story. raping for a cause. >> ♪ note. >> baltimore's inner harbor sets the stage for many performers. >> ♪ . >> as tourists pass by, business workers break for lunch and local rap artist sully jay puts his rap into motion. >> to me, to see another person happy, that's what makes me happy. >> don't get me wrong ♪ . >> he says all the songs have special meaning but one in particular, he wants you to hear. >> what my goal is, is to bring awareness to the family and to billy. >> for you billy. >> ♪ a husband and father, friend. >> billy's conscience, written for a unique circumstance. >> that one is my daddy right there. >> 3-year-old london is too young to listen to rap but old enough to lynn to her heart. >> i love my daddy. >> her daddy, billy, is in the hospital right now. he has been there more than a year, and his family has no idea when or if he will come home. >> it has been really hard. i am sorr