Orchestral Etiquette

This cute NYTimes article on "Cracking the Secret Orchestral Codes" clears up a couple of questions my sister and I had after our TSO experience last week. Namely, what the heck else does the concertmaster do for his paycheque?:

"During performances, orchestra musicians have their own internal rules, too. Never turn around if someone makes a mistake. (New York Philharmonic musicians speak of one colleague who got into hot water for doing so.) Never turn a page if someone nearby has a solo. Signal praise with a slight shuffling of the feet. For a nearby string player who has a solo, a slight rubbing of the music with the edge of the bow does the trick.

'Musicians have incredible peripheral vision,' said Carl Schiebler, the personnel manager of the Philharmonic. 'They're looking at their music and watching every nuance of the conductor. Any kind of unusual motion on the stage is noticed immediately by everybody.' At the end of the concert, the orchestra takes its cue from the concertmaster about whether to rise again. Occasionally, when the orchestra feels particular warmth toward a conductor, it will show appreciation by declining to rise (again, at the concertmaster's cue)."