Yasuko Onuki (often known simply as Yako, Yasuko or Yasuko O.) is the singer from Japanese band Melt-Banana, which she founded in 1991. She has a frantic chirping and yelping vocal style which is an important part of Melt-Banana's unique sound. She writes all of Melt-Banana's lyrics, which she sings in English, stating that:
When I first started singing in a band, I was singing in Japanese, but I changed to English. I thought that English would fit more to my style of singing.