Yoko Ueno(上野 洋子,Ueno Yōko?, born October 11, 1963) is a Japanese recording artist. She has performed in the bands, Oranges & Lemons, Vita Nova, Marsh-Mallow, and Zabadak. She is also a notable musical composer, having written music for several anime series, most prominent being .hack//Legend of the Twilight, Azumanga Daioh (where one of her bands, Oranges & Lemons, also performs both theme songs), and Brigadoon. From 1995 onwards, she has appeared as a guest singer on many CDs by Ayuo. As of late, she has taken to calling herself simply Yoko, or at least is credited as such in Sōkō no Strain, where she performs the opening song, "Message".