Those of us with children are familiar with the desire to share our values and passions with our off-spring. However, when your passion is Metallica or Nirvana it can seem a little erm... inappropriate to share your love of music with your little treasure. Giving your brood an early education in Rock is a tricky task… If you’re looking for a way to ingrain classic, time-defying, mammoth rock into your kids without the bad language and pulse quickening drums (kids don't need any less…