The A Cappella Choir will be 65 voices strong when students take the stage Sunday at the Great Bend High School Auditorium. But the choir’s traditional Vespers Concert represents thousands of voices lifted in praise over the course of eight decades.Vocal music instructor Susan Stambaugh said this will be the 24th year for herself and accompanist Nancy Baxter to lead the school’s select choir of juniors and seniors as they perform songs selected for the Christmas season. The first time the GBHS A Cappella choir sang in public was at the Vespers Concert in 1936 and the community has made it a well-attended event ever since — even if they had to reschedule for an ice storm, Stambaugh said.It means a lot to the student performers, said Stambaugh, who noted many former choir members as well as people from the community who love good music attend year after year.