. . "Both sisters learned to play instruments at a young age, including violin, piano and cello, but they never played together until high school. ???We were out on the lanai, and we just started playing music,??? says Brooke Graeff. ???It was like, ???Why haven???t we done this before??????? Inspired by the cursive script embroidered on an old family T-shirt, the 16-year-old sisters named their acoust" . . .