Two factors I used mainly to determine my list:
1) talents that have withstood the test of time to a good extent so far, although admittedly that is still a limited time frame.
2) core musical themes or attributes most likely to affect people than others and to still withstand the test of time and still remain embedded in society and how people are wired to some extent 300 years from now.
So its an extrapolation based current state and history, but what else can one go on when predicting the future?
1) talents that have withstood the test of time to a good extent so far, although admittedly that is still a limited time frame.
2) core musical themes or attributes most likely to affect people than others and to still withstand the test of time and still remain embedded in society and how people are wired to some extent 300 years from now.
So its an extrapolation based current state and history, but what else can one go on when predicting the future?