We can say that speaking French "runs in families," but I don't know anyone who would claim that speaking French is genetic. - Daniel Levitin

The multiple reinforcing cues of a good song—rhythm, melody, contour—cause music to stick in our heads. That is the reason why many ancient myths, epics, and even the Old Testament were set to music in preparation for being passed down by oral tradition across generations.

When a musical piece is too simple we tend not to like it, finding it trivial. When it is too complex, we tend not to like it, finding it unpredictable—we don't perceive it to be grounded in anything familiar. Music, or any art form... has to strike the right balance between simplicity and complexity...

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.