"This goes against all my experience. Certainly, practise is needed to become a master at something. But innate ability combined with motivation and practice will yield a result that motivation and practice could never yield on its own."
citation needed. These tone deaf kids who practised a lot ; how much focused practise did they do to improve their tone recognition, exactly? Any at all? Or was their instrument practise of the "play the same tunes over and over" kind? Was it actually "a lot" or just "some"? In what kind of environment with what kind of support?