because some people will have far greater access to the tools that enable you to learn how to do productive practise
Wot, you mean like more fast twitch fibres, a bigger VO2max, an innate sense of rhythm and ears that can tell without being taught if something is sung in key?
Suddenly DD was the fastest runner in yr4 (I lie, there was a tall boy who could just about keep ahead). There was no productive practice. She just had natural talent.
DH is obsessed about pop songs changing key, he says key changes are horrible & mutters dark things. He only had some music lessons in a few school yrs. I've read music theory and learnt how to play 2 instruments very badly after many yrs of trying, so I know what he's talking out in theory but I can't hear it. People shout at me about my lousy sense of rhythm... after all my hard work (yrs of dance lessons, too). I didn't know it was so bad but apparently it's diabolical.
Amy Winehouse sang like a caterwauling whale. Fact. Or it is to my ears, anyway.