This includes taking out crying babies and little kids. Come in and be seated before the concert starts. Your moving around makes an audience notice your sounds, not the music sounds. This includes watches, phones, beepers and anything else that might disturb others. Leave them at home.
All performers appreciate enthusiastic applause.
Loud screams, whistling, etc., belong at rock concerts, not at symphony performances. Be careful that your clapping is not so loud that it hurts the ears of the people near you. Don t do anything that makes people hear you instead of hearing the performance. If you have to use the restroom, do your best to hold it. Sit calmly until the music stops and the audience claps.