Yes the less you take with you the better. For etiquette sake you should take a handbag that's about the size of a wallet or clutch either have your coat checked in or if it's not too large neatly fold it over the back of yor chair. The seats are tight so it would be uncomfortable to handle too much baggage if you had to stand to let people past. Enjoy!
Yeah you should be but you are not allowed to record anything
I'm not sure. I didn't see anyone get searched for contraband
I agree with Janet Spinks. They do have lockers and a coat check.
Per the Pittsburgh Symphony Orchestra's webpage, they reserve the right to search any bag, if it fits comfortably under your seat you can keep it with you, otherwise you will need to check it at the coat check or put it in one of the coin operated lockers.
Yes, but there not much room in the seats so it might feel crowded with it
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