The world of performing musicians, it seems to me, is one where the dice are stacked in favour of introverts. Think of it: weeks of meticulous practice; hours spent travelling from one city to another, then the ephemeral performance itself. All solitary activities. After the concert, you make brief conversation with audience members before beating a hasty retreat; there's always another performance on the horizon, and so it's right back on the road and off to the next thing. Ironic as it may seem, public performance is tailor-made for people who are uncomfortable in large groups: the only social interaction required is in a highly prescribed form, and is over in an hour or so.