I've read and seen and heard a lot of references to Jazz and Precision basses and pick-ups, as well as a lot of types of woods used in certain basses. But what is Jazz or Precision? And what woods are the best for bass? I know it depends on what sound you want to get out of your guitar. So for playing something heavy and fast, like power metal with a lot of brain-destroying earth-shaking walls of pure energy, what should I consider worthy?