Two teens discover it isn’t quite as easy to harmonize in high school as it is with each other, when the touring version of Disney Channel’s hit High School Musical is presented by Broadway/San Diego, Dec. 26-30: Wed. at 7:30, Thur. at 2 & 7:30, Fri. at 7:30, Sat. at 2 & 7:30, Sun. at 1 & 6:30. Something for locals to sing about: The cast features two San Diego actors. Civic Theatre, Third Ave. & B St., down town, 619-570-1100; broadwaysd.com.