Please answer a question about the following article about American Idol:

As one of the most successful shows on U.S. television history, American Idol has a strong impact not just on television, but also in the wider world of entertainment. It helped create a number of highly successful recording artists, such as Kelly Clarkson, Daughtry and Carrie Underwood, as well as others of varying notability.

What show helped launched the career of Carrie Underwood?
American Idol