Ellen Bosch has overseen many a song and dance number during her years at Salem High School in New Hampshire, although the one that is likely the most memorable for her just happens to be the only one she didn't have a hand in planning Thursday. In the middle of Salem High School's annual holiday concert, more than 100 past and present students interrupted the show in order to surprise Bosch, the school's chorus instructor, with a flash mob rendition of "You Raise Me Up."
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