Etsuko Yakushimaru(やくしまる えつこ,Yakushimaru Etsuko?) is the stage name of a Japanese singer, producer and composer. She is known for her solo works including theme songs in several anime series, as well as being the lead vocal of the rock band Sōtaisei Riron. She works also as an illustrator, narrator and has collaborated or performed with the likes of Ryuuichi Sakamoto, John Zorn, and Jim O'Rourke. Initially, she did not reveal her face to the public, until the artist and her band was featured in the July 2009 edition of Studio Voice magazine. She also goes by the alias of Tika α (ティカ・α?) when credited for lyrics and composing.