Disney's "High School Musical" phenomenon leaps onto the big screen in "High School Musical 3: Senior Year," which finds high school seniors Troy and Gabriella facing the prospect of being separated from one another as they head off in different directions to college. Joined by the rest of the Wildcats, they stage an elaborate spring musical reflecting their experiences, hopes and fears about their future. With incredible new music and exciting dance numbers designed to take maximum advantage of the big screen, this motion picture extravaganza delivers plenty of high-energy entertainment from East High's talented ensemble