Death Waltz (U.N. Owen Was Her) -- Asher Denburg

The flashing fingers of Asher Denburg perform his arrangement of “Death Waltz“ at a Thanksgiving dinner party. (The original piece is performed electronically, and can't actually be played by a human being who only has ten fingers...) - - - - - - - Since posting this, I have learned that it's misnamed -- the original song comes from a Japanese game called “The Embodiment of Scarlet Devil“ in the Touhou Koumakyou series. The proper title is “U.N Owen Was Her?“ (U.N.オーエンは彼女なのか？) It's the theme of the Extra-Stage Boss, Flandre Scarlet. As a result, the song's name could also be referred to as “Flandre's Theme“.