Vocal: Twilight Sparkle (sampling from her songs)
BGM: Matryoshka (マトリョシカ)
MP3: http://www.mediafire.com/?8pvvw76xg3nmmuo
MP4: http://www.mediafire.com/?dasy5nikben5136 (English sub)
http://www.mediafire.com/?vw2x9w11x13xuxf (No English sub)

I used neither UTAU nor Auto-tunes. In order to make Twilight sing in Japanese, I extracted vowels and consonants from her songs and lined up/pitched them on REAPER. So it can be called word-splicing, I guess.