#46 The one guy who's really expressive with his body language.

Want to see something scary? Go to YouTube and type in "Lang Lang."
That guy has way too much energy to be a pianist. He should be a comedian/trapeze artist.
While it's ok for a soloist to be that way, or the lead violinist in a concerto, but people sitting in the orchestra should not be allowed to do that. (I'm the one that dances around. Not you.)
Why do people do this? At least three reasons...

1. It's the only way to draw attention to themselves.
It's an orchestra. It isn't about you third chair contrabassoons any more than it's about the first chair timpani. Maybe that's where we get the 'and' part of band; it's this guy AND that guy AND those people who don't really play their instruments AND the man with the funny facial hair. Therefore, nobody gets any attention individually.
In other words, NOBODY CAN HEAR YOU.
But they can see you.
Especially when you're pretending to have a seizure. (That really messes up your phrasing.)

2. They drink way too much coffee and are really hyper.
Drinking caffeine before a piano performance aids the performance. Maybe. It's a theory, anyway. I haven't tried very hard to prove it.
Before a band performance, not so much.
It doesn't take nearly as much energy to play the triangle as it does to play the piano. Since it's annoying to bounce your knee through the whole performance, they have to do SOMETHING to get rid of all that energy.

3. They're just getting into the music.
This is like the classical version of metal guitarists jumping the stage and headbanging, which, incidentally, can cause brain injury. If you went to that extreme during a symphony, you would not be highly respected in the classical music community. Nor would you be able to do it sitting down. However, doing weird circular movements with the upper half of your body which may resemble the mating dance of some birds is acceptable. Everything was way calmer when the music was written.

Those are my guesses on why people think it's necessary to break dance while sitting down. Why do you think they do it?