• The Great Valley High School String Orchestra is made up of students in grades 9-12 who play violin, viola, cello, string bass, and piano. Emphasis is placed on the development of individual and ensemble musical skills and performance excellence through group rehearsals, public performances, and individual practice. Occasional rehearsals will be scheduled outside the regular school day. Attendance at all rehearsals and performances is required. Students in the String Orchestra are encouraged to continue private instruction and to participate in local, district, regional, state, and national concert festivals and contests.