Quite simply, the variation within a population is far greater than the variation between populations. Individuals have genes that make them sublime musicians

Quite simply, the variation within a population is far greater than the variation between populations. Individuals have genes that make them sublime musicians or athletes or mathematicians or painters. Cultures have different patterns which set the tone of that music and sports and math and art. Since you're hedging with "peoples are genetically different" instead of "people are genetically different" I wonder if you've had some kind of formal rhetorical training.