???? (Yuuko Ishibashi, born April 3, 1980) is a Japanese soprano from Tokyo whose vocal range is said to be 4 octaves. Her songs are mainly acoustic and include genres such as folk (sometimes noticeably influenced by shimauta), neoclassical or jazz. Previously known as YOU-CO, and currently signed under Across Entertainment, she has contributed to many video game soundtracks such as Ar tonelico and Atelier Iris Grand Fantasm. multiple voice and chorus master of the ethno-healing approach to the representation of space.