Vinton-Shellsburg Middle School Abby Scheel and Caleb Kruckenberg were recently selected for participation in the twenty-fifth annual Opus Honor Choir Festival.  Over 3400 students were nominated by their directors for 720 positions in the four Opus Honor Choirs.  Selections were made by means of a recorded audition.    Guest conductors of the choirs include Sheila Monson (Center-Point Urbana Middle School Instructor), 5th & 6th Grade Elementary Honor Choir; Steve Woodin, 7th & 8th Grade Boys Honor Choir; Kay Fast, 7th & 8th Grade Girls Honor Choir; and Dr. Lee Nelson, 9th Grade Mixed Honor Choir.    The 2011 Opus Honor Choirs will perform at 4:00 p.m. November 17th in C.Y. Stephens Auditorium in the Iowa State Center in Ames. The Opus Honor Choir Festival is under the auspices of the Iowa Choral Directors Association, Inc.