I want to build my own bass and I visited my local luthier and there's a pile of mahogany, koa, etc for core wood. How in gods good earth do I know which one will be suitable for my bass, I mean tone wise? I know there's a rough guide line regarding weight, color, age, etc. But how do luthiers grade their tone woods from mediocre all the way to master grade? How do you come up with the conclusion that the wood is the best that you've ever seen before the bass itself is made?