Double is the stage name for Japanese R&B singer Takako Hirasawa (平澤貴子, Hirasawa Takako) (born March 14, 1975). Double used to be the name for the two member R&B group consisting of Takako and her sister Sachiko (1973 – 1999). After the death of Sachiko, Takako started her solo career adopting Double as her stage name in honor of her late sister.