Sing Sing Rabbit is the cartoon musician persona of Hong Kong-born artist Underthepillow. According to Sing Sing Rabbit's official website, she "represents the spirit of pursuing dreams, justice, and hope", and uses her music and creativity to spread positive messages. Singing primarily in Japanese and English, her upbeat songs coupled with lush characters and graphics have attracted fans since 2011. Additionally, SSR gained global fame after her music was used for several popular mobile games, including 無人戦争2099 in 2016 and Cytus II in 2018.

In 2014, to celebrate her 3rd anniversary as a musician, SSR used a weather balloon to send one of her rabbit mascot figurines to near space, along with a cover of the popular Japanese song "Cherry", becoming the first singer in the world to shoot a music video near space.

In addition to her music career, Sing Sing Rabbit also has a popular merchandise line of makeup brushes, toys, electronics, and stationary. Her work has been featured by the likes of Samsung and Shanghai Times Square.

She is currently signed under the Japanese management company HoriPro. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.