Abby Mitchell | Staff Intern On Tuesday, October 25, Tri-Valley hosted its annual Fall Choir Concert, featuring grades 6-12. Performing at the concert that night were all four of Tri-Valley’s choirs: 6th-Grade Chorus, 7/8th-Grade Chorus, High School Mixed Chorus, and Chamber Singers.According to choir director Bernard Van Moer, the choirs put on one concert per…