Yōko Takahashi (高橋 洋子, Takahashi Yōko?, born August 28, 1966) is a Japanese singer from Tokyo, best known for performing A Cruel Angel's Thesis (残酷な天使のテーゼ, Zankoku na Tenshi no Tēze?), the opening theme song of the anime series Neon Genesis Evangelion. She also performs the closing theme, an "acid bossa" version of "Fly Me to the Moon" and Tamashii no Rufuran (魂のルフラン, Tamashii no Rufuran?, Refrain of Soul), the closing theme of Evangelion: Death and Rebirth. She also recently performed "Metamorphose," the opening theme to studio Gainax's 20th anniversary series, This Ugly Yet Beautiful World, the ending theme Yoake Umarerekuru Shōjo (夜明け生まれ来る少女, The Girl who was Born at Dawn?) for the anime Shakugan no Shana (灼眼のシャナ, Blazing-Eyed Shana?) and the opening theme Aoki Flamme for Pumpkin Scissors (パンプキン・シザーズ, Panpukin Shizāzu?) She is also Arimi Matsuno's sister-in-law.