I just saw at  http://www.telegraph.co.uk/culture/music/opera/the-big-question/9922375/An-etiquette-guide-to-ballet-and-opera-for-beginners.html :   3. If you are tempted to join in the chorus of praise remember that opera and ballet lovers like getting their Italian gender endings correct. So: “brava!” for a woman, “bravo!” for man and “bravi!” for everyone.... and I read elsewhere that the feminine plural form is "brave."   A balletcoforum.com search gave several resul