A good piece of Spruce is loud when you knock on it and in doing so produces more body than you'd expect from something so light. If you drop it, it bonks instead of plinks. It amplifies whatever resonance you transfer into it which is EXACTLY THE POINT of an instrument top. Denser, heavier woods are harder to get to resonate. Some woods swallow, others project. Spruce projects. This wood is perfect for instruments due to its lively expressiveness.