Mark Stuart's instrument was his voice. It packed stadiums, won Grammy's, and changed lives. Then one day, his voice was gone. Stuart was the co-founder and frontman of Audio Adrenaline for most of his life. Today Mark's story has been detailed in his new book Losing My Voice to Find It: How a Rock Star Discovered His Greatest Purpose. Visit HandsAndFeetProject.org to check out the book and see how you can become involved in Mark's Haiti outreach.