In fact, public speaking anxiety may be primal and quintessentially human, not limited to those of us born with a high-reactive nervous system. One t… - Susan Cain

Consider that the simplest social interactions between two people requires performing an astonishing array of tasks: interpreting what the other person is saying; reading body language and facial expressions; smoothly taking turns talking and listening; responding to what the other person said; assessing whether you're being understood; determining whether you're well received, and, if not, figuring out how to improve or remove yourself from the situation. Think of what it takes to juggle all this at once! And that's just a one-to-one conversation. Now imagine the multitasking required in a group setting like a dinner party.
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When you listen to music, you can transcend your own pain and turn towards another and feel bonded with the whole of humanity because you know that they have felt that grief and love. By expressing it, by communing with that song or picture, you realize you are not alone.

The “Bus to Abilene” anecdote reveals our tendency to follow those who initiate action — any action. We are similarly inclined to empower dynamic speakers.