Daniel Levitin

The argument is that there may be a cluster of genes that influences both outgoingness and musicality. If this were true, we would expect to find that deviations in one ability co-occur with deviations in the other, as we do in WS and ASD.

Music may be the activity that prepared our pre-human ancestors for speech communication and for the very cognitive, representational flexibility necessary to become humans.

The best estimates are that it takes a minimum of fifty thousand years for an adaptation to show up in the human genome. This is called evolutionary lag... Our hunter-gatherer ancestors had a very different lifestyle...