In this Friday, Dec. 15, 2017 photo, Simon Nissen leads a section of his choir class in vocal warm-ups in preparation for the holiday concert at Kenai Central High School in Kenai, Alaska. Since the start of the school year, the Kenai Central High School choir has been singing. From the chambers during Borough Assembly meeting, to Soldotna Creek Park, to their own holiday concert on Dec. 17, the choir's songs have been heard throughout the community. (Kat Sorensen/Peninsula Clarion via AP)