The performance of "Summertime" by Barrino, later known simply as "<answer>Fantasia</answer>", at Top 8 was widely praised, and Simon Cowell considered it as his favorite Idol moment in the nine seasons he was on the show. <answer>Fantasia</answer> and Diana DeGarmo were the last two finalists, and <answer>Fantasia</answer> was crowned as the winner. <answer>Fantasia</answer> released as her coronation single "I Believe", a song co-written by season one finalist Tamyra Gray, and DeGarmo released "Dreams". <answer>Fantasia</answer> went on to gain some successes as a recording artist, while Hudson, who placed seventh, became the only Idol contestant so far to win both an Academy Award and a Grammy.
Who was declared the season winner?
Fantasia