What to wear, when to stand, and when to applaud…it’s all part of the “orchestral codes” that the N.Y. Times has decided to decipher. Actually, though, it’s a collection of traditions, quirks, conveniences, and, most importantly, rules of etiquette that are part and practice of a unique culture that varies from orchestra to orchestra. It all seems perfectly normal from the inside, though I can see how odd some customs may seem to observers. Many rituals arise from a desire to show respect and fondness for fellow musicians and of the art itself. The rest is mere convenience and whimsy.