High Quality Content by WIKIPEDIA articles! X is the third studio album by the brothers, K-Ci & JoJo. IT was entitled X to mark their tenth anniversary. THe album was released on December 5, 2000. THe song "Crazy" was the album's lead single. K-Ci & JoJo are an American R&B duo, consisting of brothers Cedric "K-Ci" Hailey (born September 2, 1969) and Joel "JoJo" Hailey (born June 10, 1971). NAtives of Wingate, North Carolina, they were also members of the chart-topping R&B group Jodeci with the DeGrate brothers Donald (better known as DeVante Swing) and Dalvin.