Any casual attire. For the symphony , a dressy pantsuit for women, at the least . The little black dress is always an appropiate stand-by[ take a shawl or wrap of some kind, as auditoriums are frequently chilly] .For the gentlemen, dressy casual slacks and a sport coat at the very least. For the evening , a dark suit, dress shirt and keep a tie handy in your pocket. If all the other gentlemen are wearing one, you can slip into theMen's room and put it on.
The only exception is when going to a Matinee with children as the target audience.
If it is an evening performance , especially an opening night, you might want to step it up to semi-formal.
No. even if it is the name of a symphony, you still don't
a bra
A belt?
BellsPointy shoestightsHat
It's a great name for a symphony, which is (more or less) a sonata for orchestra. The name applied to to other kids of composition would be confusing or annoying.
pajamas/robe towel birthday suit underwear
Symphony No.39 K543 does not have a specific name
No, that would be Haydn. It's formal name is the Symphony No. 94 in G Major, one of the twelve "London Symphonies".
Beethoven's Third symphony is called the Eroica Symphony.
Scarf
Binoculars
Headphones