Subject: Do magnetic fields interact with different woods?

I am a guitarist and I have heard from several other players the way the wood 
in a guitar interacts with the magnetic fields emitted from the pickups can 
change the tone. Most players say an American guitar (generally more expensive) 
has better woods which will help the sound. My question is, do magnetic fields 
really interact with wood and if they do, would higher grades of wood be better 
for achieving a greater sound?

Re: Do magnetic fields interact with different woods?