High School Musical 2 (also known as High School Musical 2: Sing It All Or Nothing!) is the sequel to the Disney Channel Original Movie; High School Musical. It debuted on August 17; 2007 on Disney Channel in the U.S.; and on Family Channel in Canada. The premiere brought in a total of 17.3 million viewers in the United Statesalmost 10 million more than its predecessormaking it; at the time; the highest-rated basic-cable broadcast in U.S. history.