Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Concert etiquette refers to a set of social norms of people who attend musical performances. These norms vary depending on the type of music performance and can be stringent or informal.Concert etiquette is particularly strong at concerts featuring music from the Classical tradition, especially those featuring an unamplified orchestra. Such audiences have come to expect quiet, and disapprove of fellow members making any kind of noise louder than light breathing. Unavoidable noise such as coughs or sneezes should be delayed until a loud passage if possible, and muffled with a handkerchief, which is most effective placed at the inner elbow joint with the entire arm then pressed over the mouth. Mobile phones and pagers should be turned off for the duration of the concert.