Black Velvet

While all this was going on, Mamasox was suiting up in a black satin party dress for her performance of Alannah Myles' "Black Velvet." The Ohio native scratched up the classic rock song even further with her Joplin drawl, impressing the judges to no end.

Ellen gave the 24-year-old a standing ovation while Simon said she "nailed" the song

Source: http://www.nydailynews.com/entertainment/americanidol/2010/05/25/2010-05-25_american_idol_finale_cystal_bowersox_impresses_judges_simon_cowell_patronizes_le.html