1. Susan Boyle
This was a difficult choice, as Susan Boyle lost in the final of the third series of Britains Got Talent to dance troupe, Diversity, and it is difficult to measure the success of a singer against a dance act. Diversity have had success in their own right, and were the first dance-based act to sell out the o2 Arena in London last year, but Susan Boyles success has been nothing short of remarkable. We all remember the first time we saw her original audition, thinking she was going to be another one of the shows laughing stock, right up until the moment she started singing. Oh how wrong we were. Despite her latest album shifting just half a million units, she has managed to sell over 20 million albums worldwide since finishing the show in second place.