highlandman at work said: "I know trained musicians who can sight play anything, yet always seem to me to have left their ears at home when they play."

this seems to be true, when people learn to play from music only they seem to find it really hard to play anything by ear.

If I learn a new tune from the music, I then have to re-learn it again to play it by ear! I think different parts of the brain deal with the two different processes.