All 29 winners of 'The Voice' ranked from least to most successful

Alexia Jayy and Adam Levine, the reigning winner and her coach. Trae Patton/NBC/Getty Images "The Voice" started in 2011, and the 29th season concluded earlier this month. In honor of the latest season, we've ranked its 29 winners from least to most successful. We considered chart history, the success of other contestants, and social media followers. "The Voice" premiered in 2011 as a brand-new take on the singing competition show. Instead of simply having celebrity judges critique contesta...