High School Musical is one of the hottest television shows in the world right now and High School Musical Ringtones are some of the most popular ringtones in America. High School Musical (sometimes abbreviated HSM) is an Emmy Award-winning American television film, and the first in the High School Musical film franchise. Upon its release on January 20, 2006, it became the most successful movie that Disney Channel Original Movie (DCOM) ever produced, with a television sequel High School Musical 2 released in 2007 and the feature film High School Musical 3: Senior Year released theatrically in October 2008. It is the first Disney Channel Original Movie to have a theatrical sequel. A fourth installment, High School Musical 4, has been announced to be in the writing stages.