Everyone should sing the same piece.   Take your time turning pages.   Do not worry if you do not have perfect pitch; you may find singing less stressful without it.   The right note at the wrong time is the wrong note.   The wrong note at the right time is still a wrong note.   A wrong note sung timidly is still a wrong note.   A wrong note sung with authority is an interpretation.   When not one note of the original remains, a true interpretation has been realized.   If you happen to sing a wrong note, glare at one of your neighbors.   If everyone gets lost except you, follow those who get lost.   If you are completely lost, stop everyone and start an argument about repeat marks.   Strive to achieve the maximum notes per second—that way you do at least gain the admiration of the totally incompetent.   If a passage is difficult, slow it down. If it is easy, speed it up—everything will work itself out in the end.   Markings for slurs, dynamics, ornaments, breathing, and so on should be totally ignored. They are only there to embellish the score.   When everyone else has finished singing, you should not sing any notes you may still have left.