My daughter is in a Celtic group at her middle (junior high) school in Maryland. The group has 1st and 2nd violins, viola, cello and guitar; sometimes vocals and pennywhistles. They need sheet music of traditional tunes for strings that are tastefully arranged. This group is open to all ages, including parents and teachers who play/sing Celtic music. I happen to be the singer. It's a lovely multi-generational experiment by the orchestra teacher.