Roger Graham Hargrave is a successful violin maker and an internationally recognised expert on classical Italian violins. For more than forty years has been lecturing and writing a...ver maisRoger Graham Hargrave is a successful violin maker and an internationally recognised expert on classical Italian violins. For more than forty years has been lecturing and writing about these instruments, and why musicians, dealers, collectors and even criminals, are prepared to pay millions of dollars to own one.ver menos