April 11, 1957br/Rehearsing with the McMinnville High School choir, C. Robert Zimmerman, director of the Portland Symphonic Choir, coaches students in preparation for the TYV League music festival which will be held here April 26 and 27. Participating will be groups from Lake Oswego, West Linn, Tigard, Newberg, Forest Grove and McMinnville. More than 350 band students will take part in the band festival April 26, and 500 vocal students, including 55 from the high school here, will participate in vocal sessions the following day. Zimmerman will direct the mass choir. Shown at right are Dick Bantsari, Ron Brown and John Dulaney, a trumpet trio working with the choir. Choir members shown are Linda Briggs, Carol Terry, Rosalie Ralston, and Leena Saarimen, from the left at front. At rear are Eileen Patier and Sue Jones and Barbara Huston.