Carrie Underwood was the winner of the fourth AMERICAN IDOL reality-TV competition. Underwood sparked a mild controversy for being the first IDOL contestant to fully embrace country music--as opposed to the more preferred Top 40 pop styles of previous winners--and subsequently win the competition with that style. Her debut single,"Inside Your Heaven," hit number one on the Billboard pop and country charts, while her 2005 debut full-length, SOME HEARTS, topped the country charts, illustrating the sheer commercial power of the AMERICAN IDOL franchise.