I don't agree that bad old phrenology is coming back in a new shape. Here I see a totally different scientific approach to the problem.
Additional to practice I think that a certain predisposition is necessary for music, which can be enhanced by breeding. Best example in history is the family of musicians Bach whose acumen is the unforgettable master Johann Sebastian (NOT P.D.Q.!).
That there is a certain relation between music and mathematics was found out some millennia ago by the Greek philosopher Pythagoras. It is obvious to the eye and the ear when you press the frets of your guitar.

Wilfried