I know that this has been done to death, but (hopefully) I'm bringing a new argument besides,"it ruins your creativity". Don't you think it would be better to learn the instrument by ear? That is, being able to hear notes exactly. You would know what sound you want, and where to go to get that sound without having to pump theory lessons in your brain. Both methods are hard work. What do you guys think? P.S. No flame-wars please, I'm begging you!