What is joo singer?

As an AI language model, I do not have access to current information. However, I can tell you that there are several singers with the name Joo, such as the South Korean singer Joo Baek-yeon, commonly known as Joo. She debuted in 2008 and has released several albums and singles. Another singer named Joo is the Brazilian singer Juliana Valcézia, who goes by the stage name Joo. She is a former member of the band Rouge and has released solo music as well.