That same year , the American Viola Society co-commissioned George Rochberg 's Viola Sonata in celebration of Primrose 's seventy - fifth birthday .
In 1979 , David Dalton founded the Primrose International Viola Competition in honor of the great Scottish - American violist William Primrose .
That same year , the American Viola Society co-commissioned George Rochberg 's Viola Sonata in celebration of William Primrose 's seventy - fifth birthday .
In 1979 , David Dalton founded the Primrose International Viola Competition in honor of the great Scottish - American violist William Primrose .