> The best the study can say is "if you want music teachers in Berlin to rate you highly, then behave this way". And this is exactly what they should have done

> The best the study can say is "if you want music teachers in Berlin to rate you highly, then behave this way". And this is exactly what they should have done. Take two groups of average players, and tell one of them to change their training style to that of the top players, and then after half a year or a year, check if their scoring improved, relative to that of the control group.