This sound is from Ultimate Songs Collection

"The Ultimate Showdown of Ultimate Destiny" is a comical song and video released on December 22, 2005. The song was written and performed by Neil Cicierega under the pseudonym "Lemon Demon" with art and Flash animation by Shawn Vulliez/altffour.
See also: Ultimate, Mirror (group), Ultimate!, I–V–vi–IV progression, Anson Lo, and Disney Princess: The Ultimate Song Collection.