Music teacher Jen Burkemper calls for a holding a high note at choir rehearsal. The Treble Choir and the Symphonic Orchestra at Hinsdale Central High School. | Jon Langham~for Sun-Times Media

Claudia Schabes sings "I'll Be Home For Christmas" at rehearsal. The Treble Choir and the Symphonic Orchestra at Hinsdale Central High School rehearsed their music for upcoming holiday concerts on Friday morning. | Jon Langham—for Sun-Times Media

Scott Nelson of Hinsdale plays the cello during rehearsal. | Jon Langham~for Sun-Times Media

Jen Burkemper leads the Treble Choir in some warmup exercises as they begin rehearsals. | Jon Langham~for Sun-Times Media

Sarah Saltiel watches for her cue during rehearsals. | Jon Langham~for Sun-Times Media

Music Department Chair Jeff Wirtz leads the Symphonic Orchestra during a rehearsal for Hinsdale Central's upcoming concert Friday. | Jon Langham—for Sun-Times Media

Cellist Carl Lamoureux of Hinsdale concentrates on his music. | Jon Langham~for Sun-Times Media

Wesley Graziano of Oak Brook plays the cello during rehearsals. The Treble Choir and the Symphonic Orchestra at Hinsdale Central High School rehearsed for upcoming concerts on Friday. | Jon Langham~for Sun-Times Media